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Finding the Fourth Proportional to 1,123.57, 1,685.36 and 877.19

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Solution

The fourth proportional to 1,123.57, 1,685.36 and 877.19 is: 1,315.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.57 : 1,685.36 = 877.19 : x
  2. Step 2: Convert to fraction form
    1,123.57/1,685.36 = 877.19/x
  3. Step 3: Cross multiply
    1,123.57x = 1,685.36 × 877.19
  4. Step 4: Simplify right side
    1,123.57x = 1,478,381.62
  5. Step 5: Solve for x
    x = 1,478,381.62/1,123.57
  6. Step 6: Final answer
    x = 1,315.79

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Double scale
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Similar ratio
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1.5x scale

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.