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Finding the Fourth Proportional to 72,973.06, 109,218.41 and 66,415.71

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Solution

The fourth proportional to 72,973.06, 109,218.41 and 66,415.71 is: 99,404.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,973.06 : 109,218.41 = 66,415.71 : x
  2. Step 2: Convert to fraction form
    72,973.06/109,218.41 = 66,415.71/x
  3. Step 3: Cross multiply
    72,973.06x = 109,218.41 × 66,415.71
  4. Step 4: Simplify right side
    72,973.06x = 7,253,818,245.22
  5. Step 5: Solve for x
    x = 7,253,818,245.22/72,973.06
  6. Step 6: Final answer
    x = 99,404.06

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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.