Home / 1,118.13-1,543.11-620.80

Finding the Fourth Proportional to 1,118.13, 1,543.11 and 620.80

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Solution

The fourth proportional to 1,118.13, 1,543.11 and 620.80 is: 856.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.13 : 1,543.11 = 620.80 : x
  2. Step 2: Convert to fraction form
    1,118.13/1,543.11 = 620.80/x
  3. Step 3: Cross multiply
    1,118.13x = 1,543.11 × 620.80
  4. Step 4: Simplify right side
    1,118.13x = 957,962.69
  5. Step 5: Solve for x
    x = 957,962.69/1,118.13
  6. Step 6: Final answer
    x = 856.75

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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.