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Finding the Fourth Proportional to 914.55, 1,371.84 and 641.07

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Solution

The fourth proportional to 914.55, 1,371.84 and 641.07 is: 961.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.55 : 1,371.84 = 641.07 : x
  2. Step 2: Convert to fraction form
    914.55/1,371.84 = 641.07/x
  3. Step 3: Cross multiply
    914.55x = 1,371.84 × 641.07
  4. Step 4: Simplify right side
    914.55x = 879,445.47
  5. Step 5: Solve for x
    x = 879,445.47/914.55
  6. Step 6: Final answer
    x = 961.62

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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.