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Finding the Fourth Proportional to 876.12, 1,210.96 and 770.42

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Solution

The fourth proportional to 876.12, 1,210.96 and 770.42 is: 1,064.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.12 : 1,210.96 = 770.42 : x
  2. Step 2: Convert to fraction form
    876.12/1,210.96 = 770.42/x
  3. Step 3: Cross multiply
    876.12x = 1,210.96 × 770.42
  4. Step 4: Simplify right side
    876.12x = 932,947.80
  5. Step 5: Solve for x
    x = 932,947.80/876.12
  6. Step 6: Final answer
    x = 1,064.86

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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.