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Finding the Fourth Proportional to 432, 646.92 and 287.28

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Solution

The fourth proportional to 432, 646.92 and 287.28 is: 430.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    432 : 646.92 = 287.28 : x
  2. Step 2: Convert to fraction form
    432/646.92 = 287.28/x
  3. Step 3: Cross multiply
    432x = 646.92 × 287.28
  4. Step 4: Simplify right side
    432x = 185,847.18
  5. Step 5: Solve for x
    x = 185,847.18/432
  6. Step 6: Final answer
    x = 430.20

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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.