Home / 1,140.28-1,710.42-318.79

Finding the Fourth Proportional to 1,140.28, 1,710.42 and 318.79

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Solution

The fourth proportional to 1,140.28, 1,710.42 and 318.79 is: 478.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.28 : 1,710.42 = 318.79 : x
  2. Step 2: Convert to fraction form
    1,140.28/1,710.42 = 318.79/x
  3. Step 3: Cross multiply
    1,140.28x = 1,710.42 × 318.79
  4. Step 4: Simplify right side
    1,140.28x = 545,264.79
  5. Step 5: Solve for x
    x = 545,264.79/1,140.28
  6. Step 6: Final answer
    x = 478.19

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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.