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Finding the Fourth Proportional to 1,781, 2,660.68 and 1,489.40

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Solution

The fourth proportional to 1,781, 2,660.68 and 1,489.40 is: 2,225.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781 : 2,660.68 = 1,489.40 : x
  2. Step 2: Convert to fraction form
    1,781/2,660.68 = 1,489.40/x
  3. Step 3: Cross multiply
    1,781x = 2,660.68 × 1,489.40
  4. Step 4: Simplify right side
    1,781x = 3,962,816.79
  5. Step 5: Solve for x
    x = 3,962,816.79/1,781
  6. Step 6: Final answer
    x = 2,225.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.