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Finding the Fourth Proportional to 100,648.43, 138,896.55 and 55,328.32

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Solution

The fourth proportional to 100,648.43, 138,896.55 and 55,328.32 is: 76,354.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,648.43 : 138,896.55 = 55,328.32 : x
  2. Step 2: Convert to fraction form
    100,648.43/138,896.55 = 55,328.32/x
  3. Step 3: Cross multiply
    100,648.43x = 138,896.55 × 55,328.32
  4. Step 4: Simplify right side
    100,648.43x = 7,684,912,556.38
  5. Step 5: Solve for x
    x = 7,684,912,556.38/100,648.43
  6. Step 6: Final answer
    x = 76,354.03

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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.