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Finding the Fourth Proportional to 771.93, 1,158.03 and 691.20

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Solution

The fourth proportional to 771.93, 1,158.03 and 691.20 is: 1,036.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.93 : 1,158.03 = 691.20 : x
  2. Step 2: Convert to fraction form
    771.93/1,158.03 = 691.20/x
  3. Step 3: Cross multiply
    771.93x = 1,158.03 × 691.20
  4. Step 4: Simplify right side
    771.93x = 800,430.34
  5. Step 5: Solve for x
    x = 800,430.34/771.93
  6. Step 6: Final answer
    x = 1,036.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.