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Finding the Fourth Proportional to 456.95, 630.68 and 390.32

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Solution

The fourth proportional to 456.95, 630.68 and 390.32 is: 538.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.95 : 630.68 = 390.32 : x
  2. Step 2: Convert to fraction form
    456.95/630.68 = 390.32/x
  3. Step 3: Cross multiply
    456.95x = 630.68 × 390.32
  4. Step 4: Simplify right side
    456.95x = 246,161.91
  5. Step 5: Solve for x
    x = 246,161.91/456.95
  6. Step 6: Final answer
    x = 538.71

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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.