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Finding the Fourth Proportional to 10,920.61, 15,066.16 and 6,721.57

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Solution

The fourth proportional to 10,920.61, 15,066.16 and 6,721.57 is: 9,273.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920.61 : 15,066.16 = 6,721.57 : x
  2. Step 2: Convert to fraction form
    10,920.61/15,066.16 = 6,721.57/x
  3. Step 3: Cross multiply
    10,920.61x = 15,066.16 × 6,721.57
  4. Step 4: Simplify right side
    10,920.61x = 101,268,249.07
  5. Step 5: Solve for x
    x = 101,268,249.07/10,920.61
  6. Step 6: Final answer
    x = 9,273.13

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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.