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Finding the Fourth Proportional to 916.08, 1,263.80 and 542.78

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Solution

The fourth proportional to 916.08, 1,263.80 and 542.78 is: 748.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.08 : 1,263.80 = 542.78 : x
  2. Step 2: Convert to fraction form
    916.08/1,263.80 = 542.78/x
  3. Step 3: Cross multiply
    916.08x = 1,263.80 × 542.78
  4. Step 4: Simplify right side
    916.08x = 685,965.36
  5. Step 5: Solve for x
    x = 685,965.36/916.08
  6. Step 6: Final answer
    x = 748.81

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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.