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Finding the Fourth Proportional to 631.61, 947.41 and 415.13

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Solution

The fourth proportional to 631.61, 947.41 and 415.13 is: 622.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.61 : 947.41 = 415.13 : x
  2. Step 2: Convert to fraction form
    631.61/947.41 = 415.13/x
  3. Step 3: Cross multiply
    631.61x = 947.41 × 415.13
  4. Step 4: Simplify right side
    631.61x = 393,299.64
  5. Step 5: Solve for x
    x = 393,299.64/631.61
  6. Step 6: Final answer
    x = 622.70

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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.