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Finding the Fourth Proportional to 642.67, 964.35 and 631.23

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Solution

The fourth proportional to 642.67, 964.35 and 631.23 is: 947.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.67 : 964.35 = 631.23 : x
  2. Step 2: Convert to fraction form
    642.67/964.35 = 631.23/x
  3. Step 3: Cross multiply
    642.67x = 964.35 × 631.23
  4. Step 4: Simplify right side
    642.67x = 608,726.65
  5. Step 5: Solve for x
    x = 608,726.65/642.67
  6. Step 6: Final answer
    x = 947.18

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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.