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Finding the Fourth Proportional to 100,111.20, 138,150 and 55,396.32

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Solution

The fourth proportional to 100,111.20, 138,150 and 55,396.32 is: 76,445.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,111.20 : 138,150 = 55,396.32 : x
  2. Step 2: Convert to fraction form
    100,111.20/138,150 = 55,396.32/x
  3. Step 3: Cross multiply
    100,111.20x = 138,150 × 55,396.32
  4. Step 4: Simplify right side
    100,111.20x = 7,653,001,608
  5. Step 5: Solve for x
    x = 7,653,001,608/100,111.20
  6. Step 6: Final answer
    x = 76,445.01

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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.