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Finding the Fourth Proportional to 15,168.32, 20,914.80 and 11,398.40

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Solution

The fourth proportional to 15,168.32, 20,914.80 and 11,398.40 is: 15,716.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,168.32 : 20,914.80 = 11,398.40 : x
  2. Step 2: Convert to fraction form
    15,168.32/20,914.80 = 11,398.40/x
  3. Step 3: Cross multiply
    15,168.32x = 20,914.80 × 11,398.40
  4. Step 4: Simplify right side
    15,168.32x = 238,395,256.32
  5. Step 5: Solve for x
    x = 238,395,256.32/15,168.32
  6. Step 6: Final answer
    x = 15,716.66

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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.