Home / 11,103.74-15,315.64-7,129.68

Finding the Fourth Proportional to 11,103.74, 15,315.64 and 7,129.68

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Solution

The fourth proportional to 11,103.74, 15,315.64 and 7,129.68 is: 9,834.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,103.74 : 15,315.64 = 7,129.68 : x
  2. Step 2: Convert to fraction form
    11,103.74/15,315.64 = 7,129.68/x
  3. Step 3: Cross multiply
    11,103.74x = 15,315.64 × 7,129.68
  4. Step 4: Simplify right side
    11,103.74x = 109,195,612.20
  5. Step 5: Solve for x
    x = 109,195,612.20/11,103.74
  6. Step 6: Final answer
    x = 9,834.13

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1.5x scale

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.