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Finding the Fourth Proportional to 749.95, 1,123.58 and 641.95

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Solution

The fourth proportional to 749.95, 1,123.58 and 641.95 is: 961.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.95 : 1,123.58 = 641.95 : x
  2. Step 2: Convert to fraction form
    749.95/1,123.58 = 641.95/x
  3. Step 3: Cross multiply
    749.95x = 1,123.58 × 641.95
  4. Step 4: Simplify right side
    749.95x = 721,278.97
  5. Step 5: Solve for x
    x = 721,278.97/749.95
  6. Step 6: Final answer
    x = 961.77

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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.