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Finding the Fourth Proportional to 1,118.26, 1,543.12 and 620.87

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Solution

The fourth proportional to 1,118.26, 1,543.12 and 620.87 is: 856.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.26 : 1,543.12 = 620.87 : x
  2. Step 2: Convert to fraction form
    1,118.26/1,543.12 = 620.87/x
  3. Step 3: Cross multiply
    1,118.26x = 1,543.12 × 620.87
  4. Step 4: Simplify right side
    1,118.26x = 958,076.91
  5. Step 5: Solve for x
    x = 958,076.91/1,118.26
  6. Step 6: Final answer
    x = 856.76

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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.