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Finding the Fourth Proportional to 129,994.64, 179,395.88 and 79,721.36

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Solution

The fourth proportional to 129,994.64, 179,395.88 and 79,721.36 is: 110,017.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,994.64 : 179,395.88 = 79,721.36 : x
  2. Step 2: Convert to fraction form
    129,994.64/179,395.88 = 79,721.36/x
  3. Step 3: Cross multiply
    129,994.64x = 179,395.88 × 79,721.36
  4. Step 4: Simplify right side
    129,994.64x = 14,301,683,532.00
  5. Step 5: Solve for x
    x = 14,301,683,532.00/129,994.64
  6. Step 6: Final answer
    x = 110,017.49

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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.