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Finding the Fourth Proportional to 860.52, 1,186.70 and 580.80

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Solution

The fourth proportional to 860.52, 1,186.70 and 580.80 is: 800.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.52 : 1,186.70 = 580.80 : x
  2. Step 2: Convert to fraction form
    860.52/1,186.70 = 580.80/x
  3. Step 3: Cross multiply
    860.52x = 1,186.70 × 580.80
  4. Step 4: Simplify right side
    860.52x = 689,235.36
  5. Step 5: Solve for x
    x = 689,235.36/860.52
  6. Step 6: Final answer
    x = 800.95

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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.