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Finding the Fourth Proportional to 915.39, 1,263.60 and 542.70

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Solution

The fourth proportional to 915.39, 1,263.60 and 542.70 is: 749.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.39 : 1,263.60 = 542.70 : x
  2. Step 2: Convert to fraction form
    915.39/1,263.60 = 542.70/x
  3. Step 3: Cross multiply
    915.39x = 1,263.60 × 542.70
  4. Step 4: Simplify right side
    915.39x = 685,755.72
  5. Step 5: Solve for x
    x = 685,755.72/915.39
  6. Step 6: Final answer
    x = 749.14

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1.5x scale

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.