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Finding the Fourth Proportional to 865.55, 1,291.04 and 839.62

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Solution

The fourth proportional to 865.55, 1,291.04 and 839.62 is: 1,252.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.55 : 1,291.04 = 839.62 : x
  2. Step 2: Convert to fraction form
    865.55/1,291.04 = 839.62/x
  3. Step 3: Cross multiply
    865.55x = 1,291.04 × 839.62
  4. Step 4: Simplify right side
    865.55x = 1,083,975.58
  5. Step 5: Solve for x
    x = 1,083,975.58/865.55
  6. Step 6: Final answer
    x = 1,252.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.