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Finding the Fourth Proportional to 540.12, 810.56 and 215.56

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Solution

The fourth proportional to 540.12, 810.56 and 215.56 is: 323.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.12 : 810.56 = 215.56 : x
  2. Step 2: Convert to fraction form
    540.12/810.56 = 215.56/x
  3. Step 3: Cross multiply
    540.12x = 810.56 × 215.56
  4. Step 4: Simplify right side
    540.12x = 174,724.31
  5. Step 5: Solve for x
    x = 174,724.31/540.12
  6. Step 6: Final answer
    x = 323.49

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Double scale
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Similar ratio
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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.