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Finding the Fourth Proportional to 861.83, 1,189.59 and 489.05

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Solution

The fourth proportional to 861.83, 1,189.59 and 489.05 is: 675.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.83 : 1,189.59 = 489.05 : x
  2. Step 2: Convert to fraction form
    861.83/1,189.59 = 489.05/x
  3. Step 3: Cross multiply
    861.83x = 1,189.59 × 489.05
  4. Step 4: Simplify right side
    861.83x = 581,774.67
  5. Step 5: Solve for x
    x = 581,774.67/861.83
  6. Step 6: Final answer
    x = 675.05

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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.