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Finding the Fourth Proportional to 45,920.80, 68,735.40 and 42,421.60

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Solution

The fourth proportional to 45,920.80, 68,735.40 and 42,421.60 is: 63,497.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,920.80 : 68,735.40 = 42,421.60 : x
  2. Step 2: Convert to fraction form
    45,920.80/68,735.40 = 42,421.60/x
  3. Step 3: Cross multiply
    45,920.80x = 68,735.40 × 42,421.60
  4. Step 4: Simplify right side
    45,920.80x = 2,915,865,644.64
  5. Step 5: Solve for x
    x = 2,915,865,644.64/45,920.80
  6. Step 6: Final answer
    x = 63,497.71

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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.