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Finding the Fourth Proportional to 128,479.05, 192,764.21 and 57,395.17

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Solution

The fourth proportional to 128,479.05, 192,764.21 and 57,395.17 is: 86,113.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,479.05 : 192,764.21 = 57,395.17 : x
  2. Step 2: Convert to fraction form
    128,479.05/192,764.21 = 57,395.17/x
  3. Step 3: Cross multiply
    128,479.05x = 192,764.21 × 57,395.17
  4. Step 4: Simplify right side
    128,479.05x = 11,063,734,602.87
  5. Step 5: Solve for x
    x = 11,063,734,602.87/128,479.05
  6. Step 6: Final answer
    x = 86,113.14

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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.