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Finding the Fourth Proportional to 921.77, 1,382.89 and 459.76

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Solution

The fourth proportional to 921.77, 1,382.89 and 459.76 is: 689.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.77 : 1,382.89 = 459.76 : x
  2. Step 2: Convert to fraction form
    921.77/1,382.89 = 459.76/x
  3. Step 3: Cross multiply
    921.77x = 1,382.89 × 459.76
  4. Step 4: Simplify right side
    921.77x = 635,792.90
  5. Step 5: Solve for x
    x = 635,792.90/921.77
  6. Step 6: Final answer
    x = 689.76

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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.