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Finding the Fourth Proportional to 72,704.19, 100,330.79 and 40,438.50

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Solution

The fourth proportional to 72,704.19, 100,330.79 and 40,438.50 is: 55,804.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,704.19 : 100,330.79 = 40,438.50 : x
  2. Step 2: Convert to fraction form
    72,704.19/100,330.79 = 40,438.50/x
  3. Step 3: Cross multiply
    72,704.19x = 100,330.79 × 40,438.50
  4. Step 4: Simplify right side
    72,704.19x = 4,057,226,752.51
  5. Step 5: Solve for x
    x = 4,057,226,752.51/72,704.19
  6. Step 6: Final answer
    x = 55,804.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.