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Finding the Fourth Proportional to 72,667,989.60, 109,022,979.60 and 21,551,238.60

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Solution

The fourth proportional to 72,667,989.60, 109,022,979.60 and 21,551,238.60 is: 32,333,084.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,667,989.60 : 109,022,979.60 = 21,551,238.60 : x
  2. Step 2: Convert to fraction form
    72,667,989.60/109,022,979.60 = 21,551,238.60/x
  3. Step 3: Cross multiply
    72,667,989.60x = 109,022,979.60 × 21,551,238.60
  4. Step 4: Simplify right side
    72,667,989.60x = 2,349,580,246,242,532.50
  5. Step 5: Solve for x
    x = 2,349,580,246,242,532.50/72,667,989.60
  6. Step 6: Final answer
    x = 32,333,084.47

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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.