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Finding the Fourth Proportional to 432.43, 595.29 and 390.86

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Solution

The fourth proportional to 432.43, 595.29 and 390.86 is: 538.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.43 : 595.29 = 390.86 : x
  2. Step 2: Convert to fraction form
    432.43/595.29 = 390.86/x
  3. Step 3: Cross multiply
    432.43x = 595.29 × 390.86
  4. Step 4: Simplify right side
    432.43x = 232,675.05
  5. Step 5: Solve for x
    x = 232,675.05/432.43
  6. Step 6: Final answer
    x = 538.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.