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Finding the Fourth Proportional to 1,002.18, 1,503.28 and 318.18

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Solution

The fourth proportional to 1,002.18, 1,503.28 and 318.18 is: 477.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.18 : 1,503.28 = 318.18 : x
  2. Step 2: Convert to fraction form
    1,002.18/1,503.28 = 318.18/x
  3. Step 3: Cross multiply
    1,002.18x = 1,503.28 × 318.18
  4. Step 4: Simplify right side
    1,002.18x = 478,313.63
  5. Step 5: Solve for x
    x = 478,313.63/1,002.18
  6. Step 6: Final answer
    x = 477.27

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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.