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Finding the Fourth Proportional to 1,011.68, 1,517.76 and 318.32

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Solution

The fourth proportional to 1,011.68, 1,517.76 and 318.32 is: 477.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.68 : 1,517.76 = 318.32 : x
  2. Step 2: Convert to fraction form
    1,011.68/1,517.76 = 318.32/x
  3. Step 3: Cross multiply
    1,011.68x = 1,517.76 × 318.32
  4. Step 4: Simplify right side
    1,011.68x = 483,133.36
  5. Step 5: Solve for x
    x = 483,133.36/1,011.68
  6. Step 6: Final answer
    x = 477.56

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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.