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Finding the Fourth Proportional to 1,126.80, 1,687.32 and 612.72

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Solution

The fourth proportional to 1,126.80, 1,687.32 and 612.72 is: 917.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.80 : 1,687.32 = 612.72 : x
  2. Step 2: Convert to fraction form
    1,126.80/1,687.32 = 612.72/x
  3. Step 3: Cross multiply
    1,126.80x = 1,687.32 × 612.72
  4. Step 4: Simplify right side
    1,126.80x = 1,033,854.71
  5. Step 5: Solve for x
    x = 1,033,854.71/1,126.80
  6. Step 6: Final answer
    x = 917.51

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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.