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Finding the Fourth Proportional to 18,781,318.70, 28,171,978.05 and 18,529,376.30

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Solution

The fourth proportional to 18,781,318.70, 28,171,978.05 and 18,529,376.30 is: 27,794,064.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781,318.70 : 28,171,978.05 = 18,529,376.30 : x
  2. Step 2: Convert to fraction form
    18,781,318.70/28,171,978.05 = 18,529,376.30/x
  3. Step 3: Cross multiply
    18,781,318.70x = 28,171,978.05 × 18,529,376.30
  4. Step 4: Simplify right side
    18,781,318.70x = 522,009,182,403,790.25
  5. Step 5: Solve for x
    x = 522,009,182,403,790.25/18,781,318.70
  6. Step 6: Final answer
    x = 27,794,064.45

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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.