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Finding the Fourth Proportional to 107,699.40, 161,721.90 and 72,793.80

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Solution

The fourth proportional to 107,699.40, 161,721.90 and 72,793.80 is: 109,307.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,699.40 : 161,721.90 = 72,793.80 : x
  2. Step 2: Convert to fraction form
    107,699.40/161,721.90 = 72,793.80/x
  3. Step 3: Cross multiply
    107,699.40x = 161,721.90 × 72,793.80
  4. Step 4: Simplify right side
    107,699.40x = 11,772,351,644.22
  5. Step 5: Solve for x
    x = 11,772,351,644.22/107,699.40
  6. Step 6: Final answer
    x = 109,307.50

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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.