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Finding the Fourth Proportional to 916.06, 1,263.80 and 542.90

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Solution

The fourth proportional to 916.06, 1,263.80 and 542.90 is: 748.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.06 : 1,263.80 = 542.90 : x
  2. Step 2: Convert to fraction form
    916.06/1,263.80 = 542.90/x
  3. Step 3: Cross multiply
    916.06x = 1,263.80 × 542.90
  4. Step 4: Simplify right side
    916.06x = 686,117.02
  5. Step 5: Solve for x
    x = 686,117.02/916.06
  6. Step 6: Final answer
    x = 748.99

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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.