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Finding the Fourth Proportional to 66,306, 99,479.75 and 42,640.27

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Solution

The fourth proportional to 66,306, 99,479.75 and 42,640.27 is: 63,973.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,306 : 99,479.75 = 42,640.27 : x
  2. Step 2: Convert to fraction form
    66,306/99,479.75 = 42,640.27/x
  3. Step 3: Cross multiply
    66,306x = 99,479.75 × 42,640.27
  4. Step 4: Simplify right side
    66,306x = 4,241,843,257.43
  5. Step 5: Solve for x
    x = 4,241,843,257.43/66,306
  6. Step 6: Final answer
    x = 63,973.75

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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.