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Finding the Fourth Proportional to 540.24, 810.45 and 215.61

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Solution

The fourth proportional to 540.24, 810.45 and 215.61 is: 323.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.24 : 810.45 = 215.61 : x
  2. Step 2: Convert to fraction form
    540.24/810.45 = 215.61/x
  3. Step 3: Cross multiply
    540.24x = 810.45 × 215.61
  4. Step 4: Simplify right side
    540.24x = 174,741.12
  5. Step 5: Solve for x
    x = 174,741.12/540.24
  6. Step 6: Final answer
    x = 323.45

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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.