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Finding the Fourth Proportional to 915.25, 1,263.21 and 542.21

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Solution

The fourth proportional to 915.25, 1,263.21 and 542.21 is: 748.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.25 : 1,263.21 = 542.21 : x
  2. Step 2: Convert to fraction form
    915.25/1,263.21 = 542.21/x
  3. Step 3: Cross multiply
    915.25x = 1,263.21 × 542.21
  4. Step 4: Simplify right side
    915.25x = 684,925.09
  5. Step 5: Solve for x
    x = 684,925.09/915.25
  6. Step 6: Final answer
    x = 748.35

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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.