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Finding the Fourth Proportional to 1,011.77, 1,517.81 and 318.50

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Solution

The fourth proportional to 1,011.77, 1,517.81 and 318.50 is: 477.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.77 : 1,517.81 = 318.50 : x
  2. Step 2: Convert to fraction form
    1,011.77/1,517.81 = 318.50/x
  3. Step 3: Cross multiply
    1,011.77x = 1,517.81 × 318.50
  4. Step 4: Simplify right side
    1,011.77x = 483,424.69
  5. Step 5: Solve for x
    x = 483,424.69/1,011.77
  6. Step 6: Final answer
    x = 477.80

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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.