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Finding the Fourth Proportional to 432.32, 647.52 and 215.52

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Solution

The fourth proportional to 432.32, 647.52 and 215.52 is: 322.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.32 : 647.52 = 215.52 : x
  2. Step 2: Convert to fraction form
    432.32/647.52 = 215.52/x
  3. Step 3: Cross multiply
    432.32x = 647.52 × 215.52
  4. Step 4: Simplify right side
    432.32x = 139,553.51
  5. Step 5: Solve for x
    x = 139,553.51/432.32
  6. Step 6: Final answer
    x = 322.80

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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.