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Finding the Fourth Proportional to 682.60, 987.85 and 682.60

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Solution

The fourth proportional to 682.60, 987.85 and 682.60 is: 987.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.60 : 987.85 = 682.60 : x
  2. Step 2: Convert to fraction form
    682.60/987.85 = 682.60/x
  3. Step 3: Cross multiply
    682.60x = 987.85 × 682.60
  4. Step 4: Simplify right side
    682.60x = 674,306.41
  5. Step 5: Solve for x
    x = 674,306.41/682.60
  6. Step 6: Final answer
    x = 987.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.