Home / 100,137.32-138,189.61-54,817.21

Finding the Fourth Proportional to 100,137.32, 138,189.61 and 54,817.21

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Solution

The fourth proportional to 100,137.32, 138,189.61 and 54,817.21 is: 75,647.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,137.32 : 138,189.61 = 54,817.21 : x
  2. Step 2: Convert to fraction form
    100,137.32/138,189.61 = 54,817.21/x
  3. Step 3: Cross multiply
    100,137.32x = 138,189.61 × 54,817.21
  4. Step 4: Simplify right side
    100,137.32x = 7,575,168,871.19
  5. Step 5: Solve for x
    x = 7,575,168,871.19/100,137.32
  6. Step 6: Final answer
    x = 75,647.81

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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.