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Finding the Fourth Proportional to 1,109.19, 1,530.69 and 860.85

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Solution

The fourth proportional to 1,109.19, 1,530.69 and 860.85 is: 1,187.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.19 : 1,530.69 = 860.85 : x
  2. Step 2: Convert to fraction form
    1,109.19/1,530.69 = 860.85/x
  3. Step 3: Cross multiply
    1,109.19x = 1,530.69 × 860.85
  4. Step 4: Simplify right side
    1,109.19x = 1,317,694.49
  5. Step 5: Solve for x
    x = 1,317,694.49/1,109.19
  6. Step 6: Final answer
    x = 1,187.98

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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.