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Finding the Fourth Proportional to 679.46, 939.87 and 568.76

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Solution

The fourth proportional to 679.46, 939.87 and 568.76 is: 786.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.46 : 939.87 = 568.76 : x
  2. Step 2: Convert to fraction form
    679.46/939.87 = 568.76/x
  3. Step 3: Cross multiply
    679.46x = 939.87 × 568.76
  4. Step 4: Simplify right side
    679.46x = 534,555.76
  5. Step 5: Solve for x
    x = 534,555.76/679.46
  6. Step 6: Final answer
    x = 786.74

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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.