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Finding the Fourth Proportional to 67,900.78, 101,856.79 and 21,153.66

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Solution

The fourth proportional to 67,900.78, 101,856.79 and 21,153.66 is: 31,732.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,900.78 : 101,856.79 = 21,153.66 : x
  2. Step 2: Convert to fraction form
    67,900.78/101,856.79 = 21,153.66/x
  3. Step 3: Cross multiply
    67,900.78x = 101,856.79 × 21,153.66
  4. Step 4: Simplify right side
    67,900.78x = 2,154,643,548.83
  5. Step 5: Solve for x
    x = 2,154,643,548.83/67,900.78
  6. Step 6: Final answer
    x = 31,732.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.