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Finding the Fourth Proportional to 100,261.80, 138,357.72 and 54,938.52

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Solution

The fourth proportional to 100,261.80, 138,357.72 and 54,938.52 is: 75,813.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,261.80 : 138,357.72 = 54,938.52 : x
  2. Step 2: Convert to fraction form
    100,261.80/138,357.72 = 54,938.52/x
  3. Step 3: Cross multiply
    100,261.80x = 138,357.72 × 54,938.52
  4. Step 4: Simplify right side
    100,261.80x = 7,601,168,367.37
  5. Step 5: Solve for x
    x = 7,601,168,367.37/100,261.80
  6. Step 6: Final answer
    x = 75,813.20

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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.