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Finding the Fourth Proportional to 681.50, 939.68 and 556.76

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Solution

The fourth proportional to 681.50, 939.68 and 556.76 is: 767.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.50 : 939.68 = 556.76 : x
  2. Step 2: Convert to fraction form
    681.50/939.68 = 556.76/x
  3. Step 3: Cross multiply
    681.50x = 939.68 × 556.76
  4. Step 4: Simplify right side
    681.50x = 523,176.24
  5. Step 5: Solve for x
    x = 523,176.24/681.50
  6. Step 6: Final answer
    x = 767.68

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.