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Finding the Fourth Proportional to 679.42, 936.76 and 561.87

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Solution

The fourth proportional to 679.42, 936.76 and 561.87 is: 774.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.42 : 936.76 = 561.87 : x
  2. Step 2: Convert to fraction form
    679.42/936.76 = 561.87/x
  3. Step 3: Cross multiply
    679.42x = 936.76 × 561.87
  4. Step 4: Simplify right side
    679.42x = 526,337.34
  5. Step 5: Solve for x
    x = 526,337.34/679.42
  6. Step 6: Final answer
    x = 774.69

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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.