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Finding the Fourth Proportional to 876.40, 1,314.60 and 667.60

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Solution

The fourth proportional to 876.40, 1,314.60 and 667.60 is: 1,001.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.40 : 1,314.60 = 667.60 : x
  2. Step 2: Convert to fraction form
    876.40/1,314.60 = 667.60/x
  3. Step 3: Cross multiply
    876.40x = 1,314.60 × 667.60
  4. Step 4: Simplify right side
    876.40x = 877,626.96
  5. Step 5: Solve for x
    x = 877,626.96/876.40
  6. Step 6: Final answer
    x = 1,001.40

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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.