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Finding the Fourth Proportional to 771.42, 1,061.48 and 749.89

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Solution

The fourth proportional to 771.42, 1,061.48 and 749.89 is: 1,031.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.42 : 1,061.48 = 749.89 : x
  2. Step 2: Convert to fraction form
    771.42/1,061.48 = 749.89/x
  3. Step 3: Cross multiply
    771.42x = 1,061.48 × 749.89
  4. Step 4: Simplify right side
    771.42x = 795,993.24
  5. Step 5: Solve for x
    x = 795,993.24/771.42
  6. Step 6: Final answer
    x = 1,031.85

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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.