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Finding the Fourth Proportional to 838.20, 1,156.30 and 572.57

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Solution

The fourth proportional to 838.20, 1,156.30 and 572.57 is: 789.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.20 : 1,156.30 = 572.57 : x
  2. Step 2: Convert to fraction form
    838.20/1,156.30 = 572.57/x
  3. Step 3: Cross multiply
    838.20x = 1,156.30 × 572.57
  4. Step 4: Simplify right side
    838.20x = 662,061.42
  5. Step 5: Solve for x
    x = 662,061.42/838.20
  6. Step 6: Final answer
    x = 789.86

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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.