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Finding the Fourth Proportional to 1,118.39, 1,543.80 and 725.45

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Solution

The fourth proportional to 1,118.39, 1,543.80 and 725.45 is: 1,001.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.39 : 1,543.80 = 725.45 : x
  2. Step 2: Convert to fraction form
    1,118.39/1,543.80 = 725.45/x
  3. Step 3: Cross multiply
    1,118.39x = 1,543.80 × 725.45
  4. Step 4: Simplify right side
    1,118.39x = 1,119,941.99
  5. Step 5: Solve for x
    x = 1,119,941.99/1,118.39
  6. Step 6: Final answer
    x = 1,001.39

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1.5x scale

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.