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Finding the Fourth Proportional to 525.40, 787.17 and 281.17

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Solution

The fourth proportional to 525.40, 787.17 and 281.17 is: 421.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.40 : 787.17 = 281.17 : x
  2. Step 2: Convert to fraction form
    525.40/787.17 = 281.17/x
  3. Step 3: Cross multiply
    525.40x = 787.17 × 281.17
  4. Step 4: Simplify right side
    525.40x = 221,328.59
  5. Step 5: Solve for x
    x = 221,328.59/525.40
  6. Step 6: Final answer
    x = 421.26

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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.