Home / 12,881.11-17,775.70-7,215.80

Finding the Fourth Proportional to 12,881.11, 17,775.70 and 7,215.80

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Solution

The fourth proportional to 12,881.11, 17,775.70 and 7,215.80 is: 9,957.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,881.11 : 17,775.70 = 7,215.80 : x
  2. Step 2: Convert to fraction form
    12,881.11/17,775.70 = 7,215.80/x
  3. Step 3: Cross multiply
    12,881.11x = 17,775.70 × 7,215.80
  4. Step 4: Simplify right side
    12,881.11x = 128,265,929.72
  5. Step 5: Solve for x
    x = 128,265,929.72/12,881.11
  6. Step 6: Final answer
    x = 9,957.68

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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.