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Finding the Fourth Proportional to 432.31, 647.94 and 386.18

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Solution

The fourth proportional to 432.31, 647.94 and 386.18 is: 578.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.31 : 647.94 = 386.18 : x
  2. Step 2: Convert to fraction form
    432.31/647.94 = 386.18/x
  3. Step 3: Cross multiply
    432.31x = 647.94 × 386.18
  4. Step 4: Simplify right side
    432.31x = 250,220.30
  5. Step 5: Solve for x
    x = 250,220.30/432.31
  6. Step 6: Final answer
    x = 578.80

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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.