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Finding the Fourth Proportional to 898.77, 1,347.19 and 641.49

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Solution

The fourth proportional to 898.77, 1,347.19 and 641.49 is: 961.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.77 : 1,347.19 = 641.49 : x
  2. Step 2: Convert to fraction form
    898.77/1,347.19 = 641.49/x
  3. Step 3: Cross multiply
    898.77x = 1,347.19 × 641.49
  4. Step 4: Simplify right side
    898.77x = 864,200.57
  5. Step 5: Solve for x
    x = 864,200.57/898.77
  6. Step 6: Final answer
    x = 961.54

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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.