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Finding the Fourth Proportional to 1,139.25, 1,573.07 and 741.12

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Solution

The fourth proportional to 1,139.25, 1,573.07 and 741.12 is: 1,023.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.25 : 1,573.07 = 741.12 : x
  2. Step 2: Convert to fraction form
    1,139.25/1,573.07 = 741.12/x
  3. Step 3: Cross multiply
    1,139.25x = 1,573.07 × 741.12
  4. Step 4: Simplify right side
    1,139.25x = 1,165,828.20
  5. Step 5: Solve for x
    x = 1,165,828.20/1,139.25
  6. Step 6: Final answer
    x = 1,023.33

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.