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Finding the Fourth Proportional to 103,920.80, 155,491.95 and 74,004.20

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Solution

The fourth proportional to 103,920.80, 155,491.95 and 74,004.20 is: 110,729.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,920.80 : 155,491.95 = 74,004.20 : x
  2. Step 2: Convert to fraction form
    103,920.80/155,491.95 = 74,004.20/x
  3. Step 3: Cross multiply
    103,920.80x = 155,491.95 × 74,004.20
  4. Step 4: Simplify right side
    103,920.80x = 11,507,057,366.19
  5. Step 5: Solve for x
    x = 11,507,057,366.19/103,920.80
  6. Step 6: Final answer
    x = 110,729.11

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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.