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Finding the Fourth Proportional to 876.80, 1,314.56 and 661.76

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Solution

The fourth proportional to 876.80, 1,314.56 and 661.76 is: 992.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.80 : 1,314.56 = 661.76 : x
  2. Step 2: Convert to fraction form
    876.80/1,314.56 = 661.76/x
  3. Step 3: Cross multiply
    876.80x = 1,314.56 × 661.76
  4. Step 4: Simplify right side
    876.80x = 869,923.23
  5. Step 5: Solve for x
    x = 869,923.23/876.80
  6. Step 6: Final answer
    x = 992.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.