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Finding the Fourth Proportional to 2,158.29, 3,239.01 and 860.13

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Solution

The fourth proportional to 2,158.29, 3,239.01 and 860.13 is: 1,290.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.29 : 3,239.01 = 860.13 : x
  2. Step 2: Convert to fraction form
    2,158.29/3,239.01 = 860.13/x
  3. Step 3: Cross multiply
    2,158.29x = 3,239.01 × 860.13
  4. Step 4: Simplify right side
    2,158.29x = 2,785,969.67
  5. Step 5: Solve for x
    x = 2,785,969.67/2,158.29
  6. Step 6: Final answer
    x = 1,290.82

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1.5x scale

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.