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Finding the Fourth Proportional to 525.38, 787.05 and 386.30

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Solution

The fourth proportional to 525.38, 787.05 and 386.30 is: 578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.38 : 787.05 = 386.30 : x
  2. Step 2: Convert to fraction form
    525.38/787.05 = 386.30/x
  3. Step 3: Cross multiply
    525.38x = 787.05 × 386.30
  4. Step 4: Simplify right side
    525.38x = 304,040.86
  5. Step 5: Solve for x
    x = 304,040.86/525.38
  6. Step 6: Final answer
    x = 578.70

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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.