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Finding the Fourth Proportional to 813.69, 1,122.81 and 459.60

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Solution

The fourth proportional to 813.69, 1,122.81 and 459.60 is: 634.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.69 : 1,122.81 = 459.60 : x
  2. Step 2: Convert to fraction form
    813.69/1,122.81 = 459.60/x
  3. Step 3: Cross multiply
    813.69x = 1,122.81 × 459.60
  4. Step 4: Simplify right side
    813.69x = 516,043.48
  5. Step 5: Solve for x
    x = 516,043.48/813.69
  6. Step 6: Final answer
    x = 634.20

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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.