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Finding the Fourth Proportional to 228,919.88, 315,908.30 and 128,317.88

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Solution

The fourth proportional to 228,919.88, 315,908.30 and 128,317.88 is: 177,078.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,919.88 : 315,908.30 = 128,317.88 : x
  2. Step 2: Convert to fraction form
    228,919.88/315,908.30 = 128,317.88/x
  3. Step 3: Cross multiply
    228,919.88x = 315,908.30 × 128,317.88
  4. Step 4: Simplify right side
    228,919.88x = 40,536,683,330.40
  5. Step 5: Solve for x
    x = 40,536,683,330.40/228,919.88
  6. Step 6: Final answer
    x = 177,078.04

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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.