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Finding the Fourth Proportional to 28,019.60, 38,665.80 and 15,443.60

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Solution

The fourth proportional to 28,019.60, 38,665.80 and 15,443.60 is: 21,311.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,019.60 : 38,665.80 = 15,443.60 : x
  2. Step 2: Convert to fraction form
    28,019.60/38,665.80 = 15,443.60/x
  3. Step 3: Cross multiply
    28,019.60x = 38,665.80 × 15,443.60
  4. Step 4: Simplify right side
    28,019.60x = 597,139,148.88
  5. Step 5: Solve for x
    x = 597,139,148.88/28,019.60
  6. Step 6: Final answer
    x = 21,311.48

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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.