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Finding the Fourth Proportional to 525.07, 787.20 and 281.80

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Solution

The fourth proportional to 525.07, 787.20 and 281.80 is: 422.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.07 : 787.20 = 281.80 : x
  2. Step 2: Convert to fraction form
    525.07/787.20 = 281.80/x
  3. Step 3: Cross multiply
    525.07x = 787.20 × 281.80
  4. Step 4: Simplify right side
    525.07x = 221,832.96
  5. Step 5: Solve for x
    x = 221,832.96/525.07
  6. Step 6: Final answer
    x = 422.48

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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.