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Finding the Fourth Proportional to 98,923.20, 148,384.80 and 72,679.20

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Solution

The fourth proportional to 98,923.20, 148,384.80 and 72,679.20 is: 109,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,923.20 : 148,384.80 = 72,679.20 : x
  2. Step 2: Convert to fraction form
    98,923.20/148,384.80 = 72,679.20/x
  3. Step 3: Cross multiply
    98,923.20x = 148,384.80 × 72,679.20
  4. Step 4: Simplify right side
    98,923.20x = 10,784,488,556.16
  5. Step 5: Solve for x
    x = 10,784,488,556.16/98,923.20
  6. Step 6: Final answer
    x = 109,018.80

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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.