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Finding the Fourth Proportional to 817.59, 1,225.78 and 525.42

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Solution

The fourth proportional to 817.59, 1,225.78 and 525.42 is: 787.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.59 : 1,225.78 = 525.42 : x
  2. Step 2: Convert to fraction form
    817.59/1,225.78 = 525.42/x
  3. Step 3: Cross multiply
    817.59x = 1,225.78 × 525.42
  4. Step 4: Simplify right side
    817.59x = 644,050.97
  5. Step 5: Solve for x
    x = 644,050.97/817.59
  6. Step 6: Final answer
    x = 787.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.