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Finding the Fourth Proportional to 28,261.44, 42,314.40 and 21,314.88

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Solution

The fourth proportional to 28,261.44, 42,314.40 and 21,314.88 is: 31,913.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,261.44 : 42,314.40 = 21,314.88 : x
  2. Step 2: Convert to fraction form
    28,261.44/42,314.40 = 21,314.88/x
  3. Step 3: Cross multiply
    28,261.44x = 42,314.40 × 21,314.88
  4. Step 4: Simplify right side
    28,261.44x = 901,926,358.27
  5. Step 5: Solve for x
    x = 901,926,358.27/28,261.44
  6. Step 6: Final answer
    x = 31,913.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.