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Finding the Fourth Proportional to 915.83, 1,263.80 and 542.73

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Solution

The fourth proportional to 915.83, 1,263.80 and 542.73 is: 748.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.83 : 1,263.80 = 542.73 : x
  2. Step 2: Convert to fraction form
    915.83/1,263.80 = 542.73/x
  3. Step 3: Cross multiply
    915.83x = 1,263.80 × 542.73
  4. Step 4: Simplify right side
    915.83x = 685,899.46
  5. Step 5: Solve for x
    x = 685,899.46/915.83
  6. Step 6: Final answer
    x = 748.94

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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.