Home / 138,161.25-190,662.53-78,545.25

Finding the Fourth Proportional to 138,161.25, 190,662.53 and 78,545.25

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Solution

The fourth proportional to 138,161.25, 190,662.53 and 78,545.25 is: 108,392.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,161.25 : 190,662.53 = 78,545.25 : x
  2. Step 2: Convert to fraction form
    138,161.25/190,662.53 = 78,545.25/x
  3. Step 3: Cross multiply
    138,161.25x = 190,662.53 × 78,545.25
  4. Step 4: Simplify right side
    138,161.25x = 14,975,635,691.76
  5. Step 5: Solve for x
    x = 14,975,635,691.76/138,161.25
  6. Step 6: Final answer
    x = 108,392.45

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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.