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Finding the Fourth Proportional to 1,003.04, 1,505.10 and 387.18

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Solution

The fourth proportional to 1,003.04, 1,505.10 and 387.18 is: 580.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.04 : 1,505.10 = 387.18 : x
  2. Step 2: Convert to fraction form
    1,003.04/1,505.10 = 387.18/x
  3. Step 3: Cross multiply
    1,003.04x = 1,505.10 × 387.18
  4. Step 4: Simplify right side
    1,003.04x = 582,744.62
  5. Step 5: Solve for x
    x = 582,744.62/1,003.04
  6. Step 6: Final answer
    x = 580.98

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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.