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Finding the Fourth Proportional to 130,138.51, 179,583.69 and 71,991.77

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Solution

The fourth proportional to 130,138.51, 179,583.69 and 71,991.77 is: 99,344.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,138.51 : 179,583.69 = 71,991.77 : x
  2. Step 2: Convert to fraction form
    130,138.51/179,583.69 = 71,991.77/x
  3. Step 3: Cross multiply
    130,138.51x = 179,583.69 × 71,991.77
  4. Step 4: Simplify right side
    130,138.51x = 12,928,547,706.23
  5. Step 5: Solve for x
    x = 12,928,547,706.23/130,138.51
  6. Step 6: Final answer
    x = 99,344.52

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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.