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Finding the Fourth Proportional to 18,718.56, 28,062.90 and 10,812.06

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Solution

The fourth proportional to 18,718.56, 28,062.90 and 10,812.06 is: 16,209.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.56 : 28,062.90 = 10,812.06 : x
  2. Step 2: Convert to fraction form
    18,718.56/28,062.90 = 10,812.06/x
  3. Step 3: Cross multiply
    18,718.56x = 28,062.90 × 10,812.06
  4. Step 4: Simplify right side
    18,718.56x = 303,417,758.57
  5. Step 5: Solve for x
    x = 303,417,758.57/18,718.56
  6. Step 6: Final answer
    x = 16,209.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.