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Finding the Fourth Proportional to 915.84, 1,263.80 and 522.80

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Solution

The fourth proportional to 915.84, 1,263.80 and 522.80 is: 721.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.84 : 1,263.80 = 522.80 : x
  2. Step 2: Convert to fraction form
    915.84/1,263.80 = 522.80/x
  3. Step 3: Cross multiply
    915.84x = 1,263.80 × 522.80
  4. Step 4: Simplify right side
    915.84x = 660,714.64
  5. Step 5: Solve for x
    x = 660,714.64/915.84
  6. Step 6: Final answer
    x = 721.43

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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.