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Finding the Fourth Proportional to 138,878.16, 191,692.44 and 81,532.32

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Solution

The fourth proportional to 138,878.16, 191,692.44 and 81,532.32 is: 112,538.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,878.16 : 191,692.44 = 81,532.32 : x
  2. Step 2: Convert to fraction form
    138,878.16/191,692.44 = 81,532.32/x
  3. Step 3: Cross multiply
    138,878.16x = 191,692.44 × 81,532.32
  4. Step 4: Simplify right side
    138,878.16x = 15,629,129,359.66
  5. Step 5: Solve for x
    x = 15,629,129,359.66/138,878.16
  6. Step 6: Final answer
    x = 112,538.42

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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.