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Finding the Fourth Proportional to 100,242.60, 138,328.92 and 54,911.58

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Solution

The fourth proportional to 100,242.60, 138,328.92 and 54,911.58 is: 75,774.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,242.60 : 138,328.92 = 54,911.58 : x
  2. Step 2: Convert to fraction form
    100,242.60/138,328.92 = 54,911.58/x
  3. Step 3: Cross multiply
    100,242.60x = 138,328.92 × 54,911.58
  4. Step 4: Simplify right side
    100,242.60x = 7,595,859,556.89
  5. Step 5: Solve for x
    x = 7,595,859,556.89/100,242.60
  6. Step 6: Final answer
    x = 75,774.77

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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.