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Finding the Fourth Proportional to 851.81, 1,175.15 and 630.68

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Solution

The fourth proportional to 851.81, 1,175.15 and 630.68 is: 870.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.81 : 1,175.15 = 630.68 : x
  2. Step 2: Convert to fraction form
    851.81/1,175.15 = 630.68/x
  3. Step 3: Cross multiply
    851.81x = 1,175.15 × 630.68
  4. Step 4: Simplify right side
    851.81x = 741,134.57
  5. Step 5: Solve for x
    x = 741,134.57/851.81
  6. Step 6: Final answer
    x = 870.08

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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.