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Finding the Fourth Proportional to 138,889.62, 191,683.25 and 78,464.16

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Solution

The fourth proportional to 138,889.62, 191,683.25 and 78,464.16 is: 108,289.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,889.62 : 191,683.25 = 78,464.16 : x
  2. Step 2: Convert to fraction form
    138,889.62/191,683.25 = 78,464.16/x
  3. Step 3: Cross multiply
    138,889.62x = 191,683.25 × 78,464.16
  4. Step 4: Simplify right side
    138,889.62x = 15,040,264,805.00
  5. Step 5: Solve for x
    x = 15,040,264,805.00/138,889.62
  6. Step 6: Final answer
    x = 108,289.34

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1.5x scale

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.