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Finding the Fourth Proportional to 102,720.80, 153,937.20 and 81,696.80

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Solution

The fourth proportional to 102,720.80, 153,937.20 and 81,696.80 is: 122,430.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,720.80 : 153,937.20 = 81,696.80 : x
  2. Step 2: Convert to fraction form
    102,720.80/153,937.20 = 81,696.80/x
  3. Step 3: Cross multiply
    102,720.80x = 153,937.20 × 81,696.80
  4. Step 4: Simplify right side
    102,720.80x = 12,576,176,640.96
  5. Step 5: Solve for x
    x = 12,576,176,640.96/102,720.80
  6. Step 6: Final answer
    x = 122,430.67

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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.