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Finding the Fourth Proportional to 66,383.51, 99,585.08 and 21,389.78

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Solution

The fourth proportional to 66,383.51, 99,585.08 and 21,389.78 is: 32,087.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,383.51 : 99,585.08 = 21,389.78 : x
  2. Step 2: Convert to fraction form
    66,383.51/99,585.08 = 21,389.78/x
  3. Step 3: Cross multiply
    66,383.51x = 99,585.08 × 21,389.78
  4. Step 4: Simplify right side
    66,383.51x = 2,130,102,952.48
  5. Step 5: Solve for x
    x = 2,130,102,952.48/66,383.51
  6. Step 6: Final answer
    x = 32,087.83

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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.