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Finding the Fourth Proportional to 828.38, 1,143.33 and 631.54

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Solution

The fourth proportional to 828.38, 1,143.33 and 631.54 is: 871.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.38 : 1,143.33 = 631.54 : x
  2. Step 2: Convert to fraction form
    828.38/1,143.33 = 631.54/x
  3. Step 3: Cross multiply
    828.38x = 1,143.33 × 631.54
  4. Step 4: Simplify right side
    828.38x = 722,058.63
  5. Step 5: Solve for x
    x = 722,058.63/828.38
  6. Step 6: Final answer
    x = 871.65

Related Problems

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Half scale
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Double scale
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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.