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Finding the Fourth Proportional to 860.92, 1,291.84 and 514.93

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Solution

The fourth proportional to 860.92, 1,291.84 and 514.93 is: 772.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.92 : 1,291.84 = 514.93 : x
  2. Step 2: Convert to fraction form
    860.92/1,291.84 = 514.93/x
  3. Step 3: Cross multiply
    860.92x = 1,291.84 × 514.93
  4. Step 4: Simplify right side
    860.92x = 665,202.65
  5. Step 5: Solve for x
    x = 665,202.65/860.92
  6. Step 6: Final answer
    x = 772.66

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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.