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Finding the Fourth Proportional to 915.77, 1,263.88 and 517.45

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Solution

The fourth proportional to 915.77, 1,263.88 and 517.45 is: 714.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.77 : 1,263.88 = 517.45 : x
  2. Step 2: Convert to fraction form
    915.77/1,263.88 = 517.45/x
  3. Step 3: Cross multiply
    915.77x = 1,263.88 × 517.45
  4. Step 4: Simplify right side
    915.77x = 653,994.99
  5. Step 5: Solve for x
    x = 653,994.99/915.77
  6. Step 6: Final answer
    x = 714.15

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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.