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Finding the Fourth Proportional to 1,317.47, 1,974.78 and 739.13

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Solution

The fourth proportional to 1,317.47, 1,974.78 and 739.13 is: 1,107.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.47 : 1,974.78 = 739.13 : x
  2. Step 2: Convert to fraction form
    1,317.47/1,974.78 = 739.13/x
  3. Step 3: Cross multiply
    1,317.47x = 1,974.78 × 739.13
  4. Step 4: Simplify right side
    1,317.47x = 1,459,609.27
  5. Step 5: Solve for x
    x = 1,459,609.27/1,317.47
  6. Step 6: Final answer
    x = 1,107.89

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1.5x scale

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.