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Finding the Fourth Proportional to 15,113.16, 20,853.69 and 8,398.61

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Solution

The fourth proportional to 15,113.16, 20,853.69 and 8,398.61 is: 11,588.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,113.16 : 20,853.69 = 8,398.61 : x
  2. Step 2: Convert to fraction form
    15,113.16/20,853.69 = 8,398.61/x
  3. Step 3: Cross multiply
    15,113.16x = 20,853.69 × 8,398.61
  4. Step 4: Simplify right side
    15,113.16x = 175,142,009.37
  5. Step 5: Solve for x
    x = 175,142,009.37/15,113.16
  6. Step 6: Final answer
    x = 11,588.71

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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.