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Finding the Fourth Proportional to 932.61, 1,287.45 and 639.39

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Solution

The fourth proportional to 932.61, 1,287.45 and 639.39 is: 882.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.61 : 1,287.45 = 639.39 : x
  2. Step 2: Convert to fraction form
    932.61/1,287.45 = 639.39/x
  3. Step 3: Cross multiply
    932.61x = 1,287.45 × 639.39
  4. Step 4: Simplify right side
    932.61x = 823,182.66
  5. Step 5: Solve for x
    x = 823,182.66/932.61
  6. Step 6: Final answer
    x = 882.67

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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.