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Finding the Fourth Proportional to 642.60, 881 and 630.92

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Solution

The fourth proportional to 642.60, 881 and 630.92 is: 864.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.60 : 881 = 630.92 : x
  2. Step 2: Convert to fraction form
    642.60/881 = 630.92/x
  3. Step 3: Cross multiply
    642.60x = 881 × 630.92
  4. Step 4: Simplify right side
    642.60x = 555,840.52
  5. Step 5: Solve for x
    x = 555,840.52/642.60
  6. Step 6: Final answer
    x = 864.99

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.