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Finding the Fourth Proportional to 456.70, 630.15 and 291.16

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Solution

The fourth proportional to 456.70, 630.15 and 291.16 is: 401.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.70 : 630.15 = 291.16 : x
  2. Step 2: Convert to fraction form
    456.70/630.15 = 291.16/x
  3. Step 3: Cross multiply
    456.70x = 630.15 × 291.16
  4. Step 4: Simplify right side
    456.70x = 183,474.47
  5. Step 5: Solve for x
    x = 183,474.47/456.70
  6. Step 6: Final answer
    x = 401.74

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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.