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Finding the Fourth Proportional to 961.85, 1,432.40 and 899.57

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Solution

The fourth proportional to 961.85, 1,432.40 and 899.57 is: 1,339.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.85 : 1,432.40 = 899.57 : x
  2. Step 2: Convert to fraction form
    961.85/1,432.40 = 899.57/x
  3. Step 3: Cross multiply
    961.85x = 1,432.40 × 899.57
  4. Step 4: Simplify right side
    961.85x = 1,288,550.28
  5. Step 5: Solve for x
    x = 1,288,550.28/961.85
  6. Step 6: Final answer
    x = 1,339.65

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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.