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Finding the Fourth Proportional to 921.38, 1,271.57 and 572.13

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Solution

The fourth proportional to 921.38, 1,271.57 and 572.13 is: 789.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,271.57 = 572.13 : x
  2. Step 2: Convert to fraction form
    921.38/1,271.57 = 572.13/x
  3. Step 3: Cross multiply
    921.38x = 1,271.57 × 572.13
  4. Step 4: Simplify right side
    921.38x = 727,500.48
  5. Step 5: Solve for x
    x = 727,500.48/921.38
  6. Step 6: Final answer
    x = 789.58

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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.