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Finding the Fourth Proportional to 1,139.04, 1,708.56 and 317.44

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Solution

The fourth proportional to 1,139.04, 1,708.56 and 317.44 is: 476.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.04 : 1,708.56 = 317.44 : x
  2. Step 2: Convert to fraction form
    1,139.04/1,708.56 = 317.44/x
  3. Step 3: Cross multiply
    1,139.04x = 1,708.56 × 317.44
  4. Step 4: Simplify right side
    1,139.04x = 542,365.29
  5. Step 5: Solve for x
    x = 542,365.29/1,139.04
  6. Step 6: Final answer
    x = 476.16

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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.