Home / 10,939.28-15,119.51-9,643.49

Finding the Fourth Proportional to 10,939.28, 15,119.51 and 9,643.49

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Solution

The fourth proportional to 10,939.28, 15,119.51 and 9,643.49 is: 13,328.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,939.28 : 15,119.51 = 9,643.49 : x
  2. Step 2: Convert to fraction form
    10,939.28/15,119.51 = 9,643.49/x
  3. Step 3: Cross multiply
    10,939.28x = 15,119.51 × 9,643.49
  4. Step 4: Simplify right side
    10,939.28x = 145,804,719.67
  5. Step 5: Solve for x
    x = 145,804,719.67/10,939.28
  6. Step 6: Final answer
    x = 13,328.55

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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.