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Finding the Fourth Proportional to 771.92, 1,158.20 and 430.16

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Solution

The fourth proportional to 771.92, 1,158.20 and 430.16 is: 645.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.92 : 1,158.20 = 430.16 : x
  2. Step 2: Convert to fraction form
    771.92/1,158.20 = 430.16/x
  3. Step 3: Cross multiply
    771.92x = 1,158.20 × 430.16
  4. Step 4: Simplify right side
    771.92x = 498,211.31
  5. Step 5: Solve for x
    x = 498,211.31/771.92
  6. Step 6: Final answer
    x = 645.42

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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.