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Finding the Fourth Proportional to 28,121, 38,807.62 and 18,202.28

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Solution

The fourth proportional to 28,121, 38,807.62 and 18,202.28 is: 25,119.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,121 : 38,807.62 = 18,202.28 : x
  2. Step 2: Convert to fraction form
    28,121/38,807.62 = 18,202.28/x
  3. Step 3: Cross multiply
    28,121x = 38,807.62 × 18,202.28
  4. Step 4: Simplify right side
    28,121x = 706,387,165.37
  5. Step 5: Solve for x
    x = 706,387,165.37/28,121
  6. Step 6: Final answer
    x = 25,119.56

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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.