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Finding the Fourth Proportional to 15,158.51, 20,918.43 and 10,378.32

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Solution

The fourth proportional to 15,158.51, 20,918.43 and 10,378.32 is: 14,321.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,158.51 : 20,918.43 = 10,378.32 : x
  2. Step 2: Convert to fraction form
    15,158.51/20,918.43 = 10,378.32/x
  3. Step 3: Cross multiply
    15,158.51x = 20,918.43 × 10,378.32
  4. Step 4: Simplify right side
    15,158.51x = 217,098,160.44
  5. Step 5: Solve for x
    x = 217,098,160.44/15,158.51
  6. Step 6: Final answer
    x = 14,321.87

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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.