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Finding the Fourth Proportional to 921.15, 1,382.31 and 459.18

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Solution

The fourth proportional to 921.15, 1,382.31 and 459.18 is: 689.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.15 : 1,382.31 = 459.18 : x
  2. Step 2: Convert to fraction form
    921.15/1,382.31 = 459.18/x
  3. Step 3: Cross multiply
    921.15x = 1,382.31 × 459.18
  4. Step 4: Simplify right side
    921.15x = 634,729.11
  5. Step 5: Solve for x
    x = 634,729.11/921.15
  6. Step 6: Final answer
    x = 689.06

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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.