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Finding the Fourth Proportional to 876.41, 1,209.27 and 666.53

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Solution

The fourth proportional to 876.41, 1,209.27 and 666.53 is: 919.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.41 : 1,209.27 = 666.53 : x
  2. Step 2: Convert to fraction form
    876.41/1,209.27 = 666.53/x
  3. Step 3: Cross multiply
    876.41x = 1,209.27 × 666.53
  4. Step 4: Simplify right side
    876.41x = 806,014.73
  5. Step 5: Solve for x
    x = 806,014.73/876.41
  6. Step 6: Final answer
    x = 919.68

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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.