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Finding the Fourth Proportional to 1,559.81, 2,152.55 and 861.19

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Solution

The fourth proportional to 1,559.81, 2,152.55 and 861.19 is: 1,188.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.81 : 2,152.55 = 861.19 : x
  2. Step 2: Convert to fraction form
    1,559.81/2,152.55 = 861.19/x
  3. Step 3: Cross multiply
    1,559.81x = 2,152.55 × 861.19
  4. Step 4: Simplify right side
    1,559.81x = 1,853,751.31
  5. Step 5: Solve for x
    x = 1,853,751.31/1,559.81
  6. Step 6: Final answer
    x = 1,188.44

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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.