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Finding the Fourth Proportional to 79,122.53, 118,643.40 and 25,780.21

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Solution

The fourth proportional to 79,122.53, 118,643.40 and 25,780.21 is: 38,657.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,122.53 : 118,643.40 = 25,780.21 : x
  2. Step 2: Convert to fraction form
    79,122.53/118,643.40 = 25,780.21/x
  3. Step 3: Cross multiply
    79,122.53x = 118,643.40 × 25,780.21
  4. Step 4: Simplify right side
    79,122.53x = 3,058,651,470.51
  5. Step 5: Solve for x
    x = 3,058,651,470.51/79,122.53
  6. Step 6: Final answer
    x = 38,657.15

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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.