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Finding the Fourth Proportional to 28,016.40, 38,662.40 and 15,441.16

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Solution

The fourth proportional to 28,016.40, 38,662.40 and 15,441.16 is: 21,308.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,016.40 : 38,662.40 = 15,441.16 : x
  2. Step 2: Convert to fraction form
    28,016.40/38,662.40 = 15,441.16/x
  3. Step 3: Cross multiply
    28,016.40x = 38,662.40 × 15,441.16
  4. Step 4: Simplify right side
    28,016.40x = 596,992,304.38
  5. Step 5: Solve for x
    x = 596,992,304.38/28,016.40
  6. Step 6: Final answer
    x = 21,308.67

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Half scale
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Find fourth proportional to 28,017.40, 38,663.78 and 15,442.16
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.