Home / 12,636.68-17,431.20-7,920.05

Finding the Fourth Proportional to 12,636.68, 17,431.20 and 7,920.05

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Solution

The fourth proportional to 12,636.68, 17,431.20 and 7,920.05 is: 10,925.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,636.68 : 17,431.20 = 7,920.05 : x
  2. Step 2: Convert to fraction form
    12,636.68/17,431.20 = 7,920.05/x
  3. Step 3: Cross multiply
    12,636.68x = 17,431.20 × 7,920.05
  4. Step 4: Simplify right side
    12,636.68x = 138,055,888.40
  5. Step 5: Solve for x
    x = 138,055,888.40/12,636.68
  6. Step 6: Final answer
    x = 10,925.02

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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.