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Finding the Fourth Proportional to 861.84, 1,189.79 and 814.76

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Solution

The fourth proportional to 861.84, 1,189.79 and 814.76 is: 1,124.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.84 : 1,189.79 = 814.76 : x
  2. Step 2: Convert to fraction form
    861.84/1,189.79 = 814.76/x
  3. Step 3: Cross multiply
    861.84x = 1,189.79 × 814.76
  4. Step 4: Simplify right side
    861.84x = 969,390.79
  5. Step 5: Solve for x
    x = 969,390.79/861.84
  6. Step 6: Final answer
    x = 1,124.79

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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.