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Finding the Fourth Proportional to 21,978,065.80, 32,967,098.70 and 18,730,808.20

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Solution

The fourth proportional to 21,978,065.80, 32,967,098.70 and 18,730,808.20 is: 28,096,212.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978,065.80 : 32,967,098.70 = 18,730,808.20 : x
  2. Step 2: Convert to fraction form
    21,978,065.80/32,967,098.70 = 18,730,808.20/x
  3. Step 3: Cross multiply
    21,978,065.80x = 32,967,098.70 × 18,730,808.20
  4. Step 4: Simplify right side
    21,978,065.80x = 617,500,402,660,169.25
  5. Step 5: Solve for x
    x = 617,500,402,660,169.25/21,978,065.80
  6. Step 6: Final answer
    x = 28,096,212.30

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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.