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Finding the Fourth Proportional to 681.45, 939.99 and 432.60

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Solution

The fourth proportional to 681.45, 939.99 and 432.60 is: 596.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.45 : 939.99 = 432.60 : x
  2. Step 2: Convert to fraction form
    681.45/939.99 = 432.60/x
  3. Step 3: Cross multiply
    681.45x = 939.99 × 432.60
  4. Step 4: Simplify right side
    681.45x = 406,639.67
  5. Step 5: Solve for x
    x = 406,639.67/681.45
  6. Step 6: Final answer
    x = 596.73

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1.5x scale

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.