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Finding the Fourth Proportional to 18,871.92, 28,285.74 and 10,113.12

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Solution

The fourth proportional to 18,871.92, 28,285.74 and 10,113.12 is: 15,157.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.92 : 28,285.74 = 10,113.12 : x
  2. Step 2: Convert to fraction form
    18,871.92/28,285.74 = 10,113.12/x
  3. Step 3: Cross multiply
    18,871.92x = 28,285.74 × 10,113.12
  4. Step 4: Simplify right side
    18,871.92x = 286,057,082.91
  5. Step 5: Solve for x
    x = 286,057,082.91/18,871.92
  6. Step 6: Final answer
    x = 15,157.82

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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.