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Finding the Fourth Proportional to 860.64, 1,187.55 and 580.43

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Solution

The fourth proportional to 860.64, 1,187.55 and 580.43 is: 800.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.64 : 1,187.55 = 580.43 : x
  2. Step 2: Convert to fraction form
    860.64/1,187.55 = 580.43/x
  3. Step 3: Cross multiply
    860.64x = 1,187.55 × 580.43
  4. Step 4: Simplify right side
    860.64x = 689,283.71
  5. Step 5: Solve for x
    x = 689,283.71/860.64
  6. Step 6: Final answer
    x = 800.90

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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.