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Finding the Fourth Proportional to 1,123.46, 1,545.68 and 990.08

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Solution

The fourth proportional to 1,123.46, 1,545.68 and 990.08 is: 1,362.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.46 : 1,545.68 = 990.08 : x
  2. Step 2: Convert to fraction form
    1,123.46/1,545.68 = 990.08/x
  3. Step 3: Cross multiply
    1,123.46x = 1,545.68 × 990.08
  4. Step 4: Simplify right side
    1,123.46x = 1,530,346.85
  5. Step 5: Solve for x
    x = 1,530,346.85/1,123.46
  6. Step 6: Final answer
    x = 1,362.17

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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.