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Finding the Fourth Proportional to 61,153.28, 91,653.12 and 21,678.08

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Solution

The fourth proportional to 61,153.28, 91,653.12 and 21,678.08 is: 32,489.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,153.28 : 91,653.12 = 21,678.08 : x
  2. Step 2: Convert to fraction form
    61,153.28/91,653.12 = 21,678.08/x
  3. Step 3: Cross multiply
    61,153.28x = 91,653.12 × 21,678.08
  4. Step 4: Simplify right side
    61,153.28x = 1,986,863,667.61
  5. Step 5: Solve for x
    x = 1,986,863,667.61/61,153.28
  6. Step 6: Final answer
    x = 32,489.90

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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.