Home / 1,938.72-2,909.20-1,117.36

Finding the Fourth Proportional to 1,938.72, 2,909.20 and 1,117.36

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Solution

The fourth proportional to 1,938.72, 2,909.20 and 1,117.36 is: 1,676.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.72 : 2,909.20 = 1,117.36 : x
  2. Step 2: Convert to fraction form
    1,938.72/2,909.20 = 1,117.36/x
  3. Step 3: Cross multiply
    1,938.72x = 2,909.20 × 1,117.36
  4. Step 4: Simplify right side
    1,938.72x = 3,250,623.71
  5. Step 5: Solve for x
    x = 3,250,623.71/1,938.72
  6. Step 6: Final answer
    x = 1,676.69

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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.