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Finding the Fourth Proportional to 572.12, 860.61 and 518.66

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Solution

The fourth proportional to 572.12, 860.61 and 518.66 is: 780.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.12 : 860.61 = 518.66 : x
  2. Step 2: Convert to fraction form
    572.12/860.61 = 518.66/x
  3. Step 3: Cross multiply
    572.12x = 860.61 × 518.66
  4. Step 4: Simplify right side
    572.12x = 446,363.98
  5. Step 5: Solve for x
    x = 446,363.98/572.12
  6. Step 6: Final answer
    x = 780.19

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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.