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Finding the Fourth Proportional to 1,661.92, 2,490.60 and 771.40

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Solution

The fourth proportional to 1,661.92, 2,490.60 and 771.40 is: 1,156.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.92 : 2,490.60 = 771.40 : x
  2. Step 2: Convert to fraction form
    1,661.92/2,490.60 = 771.40/x
  3. Step 3: Cross multiply
    1,661.92x = 2,490.60 × 771.40
  4. Step 4: Simplify right side
    1,661.92x = 1,921,248.84
  5. Step 5: Solve for x
    x = 1,921,248.84/1,661.92
  6. Step 6: Final answer
    x = 1,156.04

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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.