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Finding the Fourth Proportional to 1,586.31, 2,189.16 and 878.21

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Solution

The fourth proportional to 1,586.31, 2,189.16 and 878.21 is: 1,211.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.31 : 2,189.16 = 878.21 : x
  2. Step 2: Convert to fraction form
    1,586.31/2,189.16 = 878.21/x
  3. Step 3: Cross multiply
    1,586.31x = 2,189.16 × 878.21
  4. Step 4: Simplify right side
    1,586.31x = 1,922,531.26
  5. Step 5: Solve for x
    x = 1,922,531.26/1,586.31
  6. Step 6: Final answer
    x = 1,211.95

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1.5x scale

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.