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Finding the Fourth Proportional to 18,997.80, 26,214.78 and 10,931.16

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Solution

The fourth proportional to 18,997.80, 26,214.78 and 10,931.16 is: 15,083.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,997.80 : 26,214.78 = 10,931.16 : x
  2. Step 2: Convert to fraction form
    18,997.80/26,214.78 = 10,931.16/x
  3. Step 3: Cross multiply
    18,997.80x = 26,214.78 × 10,931.16
  4. Step 4: Simplify right side
    18,997.80x = 286,557,954.54
  5. Step 5: Solve for x
    x = 286,557,954.54/18,997.80
  6. Step 6: Final answer
    x = 15,083.74

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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.