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Finding the Fourth Proportional to 921.74, 1,382.20 and 373.78

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Solution

The fourth proportional to 921.74, 1,382.20 and 373.78 is: 560.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.74 : 1,382.20 = 373.78 : x
  2. Step 2: Convert to fraction form
    921.74/1,382.20 = 373.78/x
  3. Step 3: Cross multiply
    921.74x = 1,382.20 × 373.78
  4. Step 4: Simplify right side
    921.74x = 516,638.72
  5. Step 5: Solve for x
    x = 516,638.72/921.74
  6. Step 6: Final answer
    x = 560.50

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Double scale
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1.5x scale

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.