Home / 15,121.81-20,862.57-9,151.30

Finding the Fourth Proportional to 15,121.81, 20,862.57 and 9,151.30

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Solution

The fourth proportional to 15,121.81, 20,862.57 and 9,151.30 is: 12,625.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.81 : 20,862.57 = 9,151.30 : x
  2. Step 2: Convert to fraction form
    15,121.81/20,862.57 = 9,151.30/x
  3. Step 3: Cross multiply
    15,121.81x = 20,862.57 × 9,151.30
  4. Step 4: Simplify right side
    15,121.81x = 190,919,636.84
  5. Step 5: Solve for x
    x = 190,919,636.84/15,121.81
  6. Step 6: Final answer
    x = 12,625.45

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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.