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Finding the Fourth Proportional to 1,126.62, 1,555.35 and 865.50

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Solution

The fourth proportional to 1,126.62, 1,555.35 and 865.50 is: 1,194.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.62 : 1,555.35 = 865.50 : x
  2. Step 2: Convert to fraction form
    1,126.62/1,555.35 = 865.50/x
  3. Step 3: Cross multiply
    1,126.62x = 1,555.35 × 865.50
  4. Step 4: Simplify right side
    1,126.62x = 1,346,155.43
  5. Step 5: Solve for x
    x = 1,346,155.43/1,126.62
  6. Step 6: Final answer
    x = 1,194.86

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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.