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Finding the Fourth Proportional to 838.68, 1,158.50 and 644.61

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Solution

The fourth proportional to 838.68, 1,158.50 and 644.61 is: 890.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.68 : 1,158.50 = 644.61 : x
  2. Step 2: Convert to fraction form
    838.68/1,158.50 = 644.61/x
  3. Step 3: Cross multiply
    838.68x = 1,158.50 × 644.61
  4. Step 4: Simplify right side
    838.68x = 746,780.69
  5. Step 5: Solve for x
    x = 746,780.69/838.68
  6. Step 6: Final answer
    x = 890.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.