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Finding the Fourth Proportional to 1,175, 1,761.68 and 712.90

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Solution

The fourth proportional to 1,175, 1,761.68 and 712.90 is: 1,068.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175 : 1,761.68 = 712.90 : x
  2. Step 2: Convert to fraction form
    1,175/1,761.68 = 712.90/x
  3. Step 3: Cross multiply
    1,175x = 1,761.68 × 712.90
  4. Step 4: Simplify right side
    1,175x = 1,255,901.67
  5. Step 5: Solve for x
    x = 1,255,901.67/1,175
  6. Step 6: Final answer
    x = 1,068.85

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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.