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Finding the Fourth Proportional to 813.32, 1,220.25 and 540.49

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Solution

The fourth proportional to 813.32, 1,220.25 and 540.49 is: 810.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.32 : 1,220.25 = 540.49 : x
  2. Step 2: Convert to fraction form
    813.32/1,220.25 = 540.49/x
  3. Step 3: Cross multiply
    813.32x = 1,220.25 × 540.49
  4. Step 4: Simplify right side
    813.32x = 659,526.82
  5. Step 5: Solve for x
    x = 659,526.82/813.32
  6. Step 6: Final answer
    x = 810.91

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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.