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Finding the Fourth Proportional to 1,781.60, 2,673.68 and 807.84

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Solution

The fourth proportional to 1,781.60, 2,673.68 and 807.84 is: 1,212.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.60 : 2,673.68 = 807.84 : x
  2. Step 2: Convert to fraction form
    1,781.60/2,673.68 = 807.84/x
  3. Step 3: Cross multiply
    1,781.60x = 2,673.68 × 807.84
  4. Step 4: Simplify right side
    1,781.60x = 2,159,901.61
  5. Step 5: Solve for x
    x = 2,159,901.61/1,781.60
  6. Step 6: Final answer
    x = 1,212.34

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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.