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Finding the Fourth Proportional to 102,751.20, 154,126.80 and 79,423.20

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Solution

The fourth proportional to 102,751.20, 154,126.80 and 79,423.20 is: 119,134.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,751.20 : 154,126.80 = 79,423.20 : x
  2. Step 2: Convert to fraction form
    102,751.20/154,126.80 = 79,423.20/x
  3. Step 3: Cross multiply
    102,751.20x = 154,126.80 × 79,423.20
  4. Step 4: Simplify right side
    102,751.20x = 12,241,243,661.76
  5. Step 5: Solve for x
    x = 12,241,243,661.76/102,751.20
  6. Step 6: Final answer
    x = 119,134.80

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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.