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Finding the Fourth Proportional to 1,011.77, 1,517.65 and 318.49

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Solution

The fourth proportional to 1,011.77, 1,517.65 and 318.49 is: 477.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.77 : 1,517.65 = 318.49 : x
  2. Step 2: Convert to fraction form
    1,011.77/1,517.65 = 318.49/x
  3. Step 3: Cross multiply
    1,011.77x = 1,517.65 × 318.49
  4. Step 4: Simplify right side
    1,011.77x = 483,356.35
  5. Step 5: Solve for x
    x = 483,356.35/1,011.77
  6. Step 6: Final answer
    x = 477.73

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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.