Home / 1,245.12-1,868-1,109.10

Finding the Fourth Proportional to 1,245.12, 1,868 and 1,109.10

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Solution

The fourth proportional to 1,245.12, 1,868 and 1,109.10 is: 1,663.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.12 : 1,868 = 1,109.10 : x
  2. Step 2: Convert to fraction form
    1,245.12/1,868 = 1,109.10/x
  3. Step 3: Cross multiply
    1,245.12x = 1,868 × 1,109.10
  4. Step 4: Simplify right side
    1,245.12x = 2,071,798.80
  5. Step 5: Solve for x
    x = 2,071,798.80/1,245.12
  6. Step 6: Final answer
    x = 1,663.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.