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Finding the Fourth Proportional to 1,559.40, 2,151.99 and 860.77

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Solution

The fourth proportional to 1,559.40, 2,151.99 and 860.77 is: 1,187.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.40 : 2,151.99 = 860.77 : x
  2. Step 2: Convert to fraction form
    1,559.40/2,151.99 = 860.77/x
  3. Step 3: Cross multiply
    1,559.40x = 2,151.99 × 860.77
  4. Step 4: Simplify right side
    1,559.40x = 1,852,368.43
  5. Step 5: Solve for x
    x = 1,852,368.43/1,559.40
  6. Step 6: Final answer
    x = 1,187.87

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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.