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Finding the Fourth Proportional to 1,559.32, 2,151.70 and 860.60

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Solution

The fourth proportional to 1,559.32, 2,151.70 and 860.60 is: 1,187.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.32 : 2,151.70 = 860.60 : x
  2. Step 2: Convert to fraction form
    1,559.32/2,151.70 = 860.60/x
  3. Step 3: Cross multiply
    1,559.32x = 2,151.70 × 860.60
  4. Step 4: Simplify right side
    1,559.32x = 1,851,753.02
  5. Step 5: Solve for x
    x = 1,851,753.02/1,559.32
  6. Step 6: Final answer
    x = 1,187.54

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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.