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Finding the Fourth Proportional to 1,118.05, 1,543.10 and 620.85

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Solution

The fourth proportional to 1,118.05, 1,543.10 and 620.85 is: 856.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.05 : 1,543.10 = 620.85 : x
  2. Step 2: Convert to fraction form
    1,118.05/1,543.10 = 620.85/x
  3. Step 3: Cross multiply
    1,118.05x = 1,543.10 × 620.85
  4. Step 4: Simplify right side
    1,118.05x = 958,030.53
  5. Step 5: Solve for x
    x = 958,030.53/1,118.05
  6. Step 6: Final answer
    x = 856.88

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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.