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Finding the Fourth Proportional to 820.32, 1,131.30 and 540.47

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Solution

The fourth proportional to 820.32, 1,131.30 and 540.47 is: 745.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.32 : 1,131.30 = 540.47 : x
  2. Step 2: Convert to fraction form
    820.32/1,131.30 = 540.47/x
  3. Step 3: Cross multiply
    820.32x = 1,131.30 × 540.47
  4. Step 4: Simplify right side
    820.32x = 611,428.05
  5. Step 5: Solve for x
    x = 611,428.05/820.32
  6. Step 6: Final answer
    x = 745.35

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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.