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Finding the Fourth Proportional to 921.42, 1,382.49 and 434.88

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Solution

The fourth proportional to 921.42, 1,382.49 and 434.88 is: 652.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.42 : 1,382.49 = 434.88 : x
  2. Step 2: Convert to fraction form
    921.42/1,382.49 = 434.88/x
  3. Step 3: Cross multiply
    921.42x = 1,382.49 × 434.88
  4. Step 4: Simplify right side
    921.42x = 601,217.25
  5. Step 5: Solve for x
    x = 601,217.25/921.42
  6. Step 6: Final answer
    x = 652.49

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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.