Home / 8,919.90-12,315.49-7,972.65

Finding the Fourth Proportional to 8,919.90, 12,315.49 and 7,972.65

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Solution

The fourth proportional to 8,919.90, 12,315.49 and 7,972.65 is: 11,007.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.90 : 12,315.49 = 7,972.65 : x
  2. Step 2: Convert to fraction form
    8,919.90/12,315.49 = 7,972.65/x
  3. Step 3: Cross multiply
    8,919.90x = 12,315.49 × 7,972.65
  4. Step 4: Simplify right side
    8,919.90x = 98,187,071.42
  5. Step 5: Solve for x
    x = 98,187,071.42/8,919.90
  6. Step 6: Final answer
    x = 11,007.64

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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.