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Finding the Fourth Proportional to 28,407.60, 42,609.96 and 7,631.28

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Solution

The fourth proportional to 28,407.60, 42,609.96 and 7,631.28 is: 11,446.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407.60 : 42,609.96 = 7,631.28 : x
  2. Step 2: Convert to fraction form
    28,407.60/42,609.96 = 7,631.28/x
  3. Step 3: Cross multiply
    28,407.60x = 42,609.96 × 7,631.28
  4. Step 4: Simplify right side
    28,407.60x = 325,168,535.55
  5. Step 5: Solve for x
    x = 325,168,535.55/28,407.60
  6. Step 6: Final answer
    x = 11,446.53

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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.