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Finding the Fourth Proportional to 1,191.15, 1,644.27 and 749.16

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Solution

The fourth proportional to 1,191.15, 1,644.27 and 749.16 is: 1,034.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.15 : 1,644.27 = 749.16 : x
  2. Step 2: Convert to fraction form
    1,191.15/1,644.27 = 749.16/x
  3. Step 3: Cross multiply
    1,191.15x = 1,644.27 × 749.16
  4. Step 4: Simplify right side
    1,191.15x = 1,231,821.31
  5. Step 5: Solve for x
    x = 1,231,821.31/1,191.15
  6. Step 6: Final answer
    x = 1,034.14

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Half scale
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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.