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Finding the Fourth Proportional to 100,699.17, 150,720.21 and 74,038.11

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Solution

The fourth proportional to 100,699.17, 150,720.21 and 74,038.11 is: 110,815.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,699.17 : 150,720.21 = 74,038.11 : x
  2. Step 2: Convert to fraction form
    100,699.17/150,720.21 = 74,038.11/x
  3. Step 3: Cross multiply
    100,699.17x = 150,720.21 × 74,038.11
  4. Step 4: Simplify right side
    100,699.17x = 11,159,039,487.20
  5. Step 5: Solve for x
    x = 11,159,039,487.20/100,699.17
  6. Step 6: Final answer
    x = 110,815.61

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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.