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Finding the Fourth Proportional to 1,559.91, 2,152.62 and 861.29

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Solution

The fourth proportional to 1,559.91, 2,152.62 and 861.29 is: 1,188.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.91 : 2,152.62 = 861.29 : x
  2. Step 2: Convert to fraction form
    1,559.91/2,152.62 = 861.29/x
  3. Step 3: Cross multiply
    1,559.91x = 2,152.62 × 861.29
  4. Step 4: Simplify right side
    1,559.91x = 1,854,030.08
  5. Step 5: Solve for x
    x = 1,854,030.08/1,559.91
  6. Step 6: Final answer
    x = 1,188.55

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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.