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Finding the Fourth Proportional to 915.34, 1,263.17 and 495.70

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Solution

The fourth proportional to 915.34, 1,263.17 and 495.70 is: 684.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.34 : 1,263.17 = 495.70 : x
  2. Step 2: Convert to fraction form
    915.34/1,263.17 = 495.70/x
  3. Step 3: Cross multiply
    915.34x = 1,263.17 × 495.70
  4. Step 4: Simplify right side
    915.34x = 626,147.05
  5. Step 5: Solve for x
    x = 626,147.05/915.34
  6. Step 6: Final answer
    x = 684.06

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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.