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Finding the Fourth Proportional to 1,143.80, 1,715.70 and 1,123.55

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Solution

The fourth proportional to 1,143.80, 1,715.70 and 1,123.55 is: 1,685.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.80 : 1,715.70 = 1,123.55 : x
  2. Step 2: Convert to fraction form
    1,143.80/1,715.70 = 1,123.55/x
  3. Step 3: Cross multiply
    1,143.80x = 1,715.70 × 1,123.55
  4. Step 4: Simplify right side
    1,143.80x = 1,927,674.74
  5. Step 5: Solve for x
    x = 1,927,674.74/1,143.80
  6. Step 6: Final answer
    x = 1,685.33

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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.