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Finding the Fourth Proportional to 1,591.67, 2,388.18 and 860.40

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Solution

The fourth proportional to 1,591.67, 2,388.18 and 860.40 is: 1,290.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,591.67 : 2,388.18 = 860.40 : x
  2. Step 2: Convert to fraction form
    1,591.67/2,388.18 = 860.40/x
  3. Step 3: Cross multiply
    1,591.67x = 2,388.18 × 860.40
  4. Step 4: Simplify right side
    1,591.67x = 2,054,790.07
  5. Step 5: Solve for x
    x = 2,054,790.07/1,591.67
  6. Step 6: Final answer
    x = 1,290.96

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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.