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Finding the Fourth Proportional to 15,220.32, 20,995.48 and 8,931.48

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Solution

The fourth proportional to 15,220.32, 20,995.48 and 8,931.48 is: 12,320.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,220.32 : 20,995.48 = 8,931.48 : x
  2. Step 2: Convert to fraction form
    15,220.32/20,995.48 = 8,931.48/x
  3. Step 3: Cross multiply
    15,220.32x = 20,995.48 × 8,931.48
  4. Step 4: Simplify right side
    15,220.32x = 187,520,709.71
  5. Step 5: Solve for x
    x = 187,520,709.71/15,220.32
  6. Step 6: Final answer
    x = 12,320.42

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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.