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Finding the Fourth Proportional to 786.85, 1,085.87 and 432.80

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Solution

The fourth proportional to 786.85, 1,085.87 and 432.80 is: 597.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.85 : 1,085.87 = 432.80 : x
  2. Step 2: Convert to fraction form
    786.85/1,085.87 = 432.80/x
  3. Step 3: Cross multiply
    786.85x = 1,085.87 × 432.80
  4. Step 4: Simplify right side
    786.85x = 469,964.57
  5. Step 5: Solve for x
    x = 469,964.57/786.85
  6. Step 6: Final answer
    x = 597.28

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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.