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Finding the Fourth Proportional to 28,188,276.80, 42,282,415.20 and 21,810,984.80

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Solution

The fourth proportional to 28,188,276.80, 42,282,415.20 and 21,810,984.80 is: 32,716,477.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,188,276.80 : 42,282,415.20 = 21,810,984.80 : x
  2. Step 2: Convert to fraction form
    28,188,276.80/42,282,415.20 = 21,810,984.80/x
  3. Step 3: Cross multiply
    28,188,276.80x = 42,282,415.20 × 21,810,984.80
  4. Step 4: Simplify right side
    28,188,276.80x = 922,221,115,234,489
  5. Step 5: Solve for x
    x = 922,221,115,234,489/28,188,276.80
  6. Step 6: Final answer
    x = 32,716,477.20

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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.