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Finding the Fourth Proportional to 28,978,911.12, 39,990,084.84 and 15,926,165.04

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Solution

The fourth proportional to 28,978,911.12, 39,990,084.84 and 15,926,165.04 is: 21,977,661.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978,911.12 : 39,990,084.84 = 15,926,165.04 : x
  2. Step 2: Convert to fraction form
    28,978,911.12/39,990,084.84 = 15,926,165.04/x
  3. Step 3: Cross multiply
    28,978,911.12x = 39,990,084.84 × 15,926,165.04
  4. Step 4: Simplify right side
    28,978,911.12x = 636,888,691,125,442
  5. Step 5: Solve for x
    x = 636,888,691,125,442/28,978,911.12
  6. Step 6: Final answer
    x = 21,977,661.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.