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Finding the Fourth Proportional to 72,905.94, 109,390.65 and 25,555.08

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Solution

The fourth proportional to 72,905.94, 109,390.65 and 25,555.08 is: 38,343.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,905.94 : 109,390.65 = 25,555.08 : x
  2. Step 2: Convert to fraction form
    72,905.94/109,390.65 = 25,555.08/x
  3. Step 3: Cross multiply
    72,905.94x = 109,390.65 × 25,555.08
  4. Step 4: Simplify right side
    72,905.94x = 2,795,486,812.00
  5. Step 5: Solve for x
    x = 2,795,486,812.00/72,905.94
  6. Step 6: Final answer
    x = 38,343.75

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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.