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Finding the Fourth Proportional to 816.40, 1,126.72 and 462.38

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Solution

The fourth proportional to 816.40, 1,126.72 and 462.38 is: 638.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.40 : 1,126.72 = 462.38 : x
  2. Step 2: Convert to fraction form
    816.40/1,126.72 = 462.38/x
  3. Step 3: Cross multiply
    816.40x = 1,126.72 × 462.38
  4. Step 4: Simplify right side
    816.40x = 520,972.79
  5. Step 5: Solve for x
    x = 520,972.79/816.40
  6. Step 6: Final answer
    x = 638.13

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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.