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Finding the Fourth Proportional to 1,018.31, 1,527.48 and 287.90

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Solution

The fourth proportional to 1,018.31, 1,527.48 and 287.90 is: 431.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.31 : 1,527.48 = 287.90 : x
  2. Step 2: Convert to fraction form
    1,018.31/1,527.48 = 287.90/x
  3. Step 3: Cross multiply
    1,018.31x = 1,527.48 × 287.90
  4. Step 4: Simplify right side
    1,018.31x = 439,761.49
  5. Step 5: Solve for x
    x = 439,761.49/1,018.31
  6. Step 6: Final answer
    x = 431.85

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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.