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Finding the Fourth Proportional to 72,917.70, 109,376.55 and 43,320.30

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Solution

The fourth proportional to 72,917.70, 109,376.55 and 43,320.30 is: 64,980.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,917.70 : 109,376.55 = 43,320.30 : x
  2. Step 2: Convert to fraction form
    72,917.70/109,376.55 = 43,320.30/x
  3. Step 3: Cross multiply
    72,917.70x = 109,376.55 × 43,320.30
  4. Step 4: Simplify right side
    72,917.70x = 4,738,224,958.97
  5. Step 5: Solve for x
    x = 4,738,224,958.97/72,917.70
  6. Step 6: Final answer
    x = 64,980.45

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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.