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Finding the Fourth Proportional to 915.20, 1,262.69 and 522.15

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Solution

The fourth proportional to 915.20, 1,262.69 and 522.15 is: 720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.20 : 1,262.69 = 522.15 : x
  2. Step 2: Convert to fraction form
    915.20/1,262.69 = 522.15/x
  3. Step 3: Cross multiply
    915.20x = 1,262.69 × 522.15
  4. Step 4: Simplify right side
    915.20x = 659,308.20
  5. Step 5: Solve for x
    x = 659,308.20/915.20
  6. Step 6: Final answer
    x = 720.40

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Double scale
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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.