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Finding the Fourth Proportional to 1,705.32, 2,560.05 and 781.11

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Solution

The fourth proportional to 1,705.32, 2,560.05 and 781.11 is: 1,172.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,705.32 : 2,560.05 = 781.11 : x
  2. Step 2: Convert to fraction form
    1,705.32/2,560.05 = 781.11/x
  3. Step 3: Cross multiply
    1,705.32x = 2,560.05 × 781.11
  4. Step 4: Simplify right side
    1,705.32x = 1,999,680.66
  5. Step 5: Solve for x
    x = 1,999,680.66/1,705.32
  6. Step 6: Final answer
    x = 1,172.61

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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.