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Finding the Fourth Proportional to 1,118.60, 1,543.86 and 699.22

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Solution

The fourth proportional to 1,118.60, 1,543.86 and 699.22 is: 965.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.60 : 1,543.86 = 699.22 : x
  2. Step 2: Convert to fraction form
    1,118.60/1,543.86 = 699.22/x
  3. Step 3: Cross multiply
    1,118.60x = 1,543.86 × 699.22
  4. Step 4: Simplify right side
    1,118.60x = 1,079,497.79
  5. Step 5: Solve for x
    x = 1,079,497.79/1,118.60
  6. Step 6: Final answer
    x = 965.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.