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Finding the Fourth Proportional to 729.95, 1,089.79 and 641.77

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Solution

The fourth proportional to 729.95, 1,089.79 and 641.77 is: 958.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.95 : 1,089.79 = 641.77 : x
  2. Step 2: Convert to fraction form
    729.95/1,089.79 = 641.77/x
  3. Step 3: Cross multiply
    729.95x = 1,089.79 × 641.77
  4. Step 4: Simplify right side
    729.95x = 699,390.20
  5. Step 5: Solve for x
    x = 699,390.20/729.95
  6. Step 6: Final answer
    x = 958.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.