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Finding the Fourth Proportional to 875.15, 1,310.70 and 668.60

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Solution

The fourth proportional to 875.15, 1,310.70 and 668.60 is: 1,001.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.15 : 1,310.70 = 668.60 : x
  2. Step 2: Convert to fraction form
    875.15/1,310.70 = 668.60/x
  3. Step 3: Cross multiply
    875.15x = 1,310.70 × 668.60
  4. Step 4: Simplify right side
    875.15x = 876,334.02
  5. Step 5: Solve for x
    x = 876,334.02/875.15
  6. Step 6: Final answer
    x = 1,001.35

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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.