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Finding the Fourth Proportional to 871.80, 1,202.72 and 761.28

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Solution

The fourth proportional to 871.80, 1,202.72 and 761.28 is: 1,050.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.80 : 1,202.72 = 761.28 : x
  2. Step 2: Convert to fraction form
    871.80/1,202.72 = 761.28/x
  3. Step 3: Cross multiply
    871.80x = 1,202.72 × 761.28
  4. Step 4: Simplify right side
    871.80x = 915,606.68
  5. Step 5: Solve for x
    x = 915,606.68/871.80
  6. Step 6: Final answer
    x = 1,050.25

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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.