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Finding the Fourth Proportional to 153,889.10, 212,377.62 and 85,919.44

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Solution

The fourth proportional to 153,889.10, 212,377.62 and 85,919.44 is: 118,574.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,889.10 : 212,377.62 = 85,919.44 : x
  2. Step 2: Convert to fraction form
    153,889.10/212,377.62 = 85,919.44/x
  3. Step 3: Cross multiply
    153,889.10x = 212,377.62 × 85,919.44
  4. Step 4: Simplify right side
    153,889.10x = 18,247,366,178.93
  5. Step 5: Solve for x
    x = 18,247,366,178.93/153,889.10
  6. Step 6: Final answer
    x = 118,574.78

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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.