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Finding the Fourth Proportional to 15,143.56, 20,894.92 and 8,854.72

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Solution

The fourth proportional to 15,143.56, 20,894.92 and 8,854.72 is: 12,217.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.56 : 20,894.92 = 8,854.72 : x
  2. Step 2: Convert to fraction form
    15,143.56/20,894.92 = 8,854.72/x
  3. Step 3: Cross multiply
    15,143.56x = 20,894.92 × 8,854.72
  4. Step 4: Simplify right side
    15,143.56x = 185,018,666.02
  5. Step 5: Solve for x
    x = 185,018,666.02/15,143.56
  6. Step 6: Final answer
    x = 12,217.65

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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.