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Finding the Fourth Proportional to 153,872.99, 212,380.14 and 90,231.29

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Solution

The fourth proportional to 153,872.99, 212,380.14 and 90,231.29 is: 124,539.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,872.99 : 212,380.14 = 90,231.29 : x
  2. Step 2: Convert to fraction form
    153,872.99/212,380.14 = 90,231.29/x
  3. Step 3: Cross multiply
    153,872.99x = 212,380.14 × 90,231.29
  4. Step 4: Simplify right side
    153,872.99x = 19,163,332,940.68
  5. Step 5: Solve for x
    x = 19,163,332,940.68/153,872.99
  6. Step 6: Final answer
    x = 124,539.94

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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.