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Finding the Fourth Proportional to 1,138.97, 1,570.74 and 718.85

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Solution

The fourth proportional to 1,138.97, 1,570.74 and 718.85 is: 991.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.97 : 1,570.74 = 718.85 : x
  2. Step 2: Convert to fraction form
    1,138.97/1,570.74 = 718.85/x
  3. Step 3: Cross multiply
    1,138.97x = 1,570.74 × 718.85
  4. Step 4: Simplify right side
    1,138.97x = 1,129,126.45
  5. Step 5: Solve for x
    x = 1,129,126.45/1,138.97
  6. Step 6: Final answer
    x = 991.36

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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.