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Finding the Fourth Proportional to 100,478.72, 138,660.18 and 55,155.50

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Solution

The fourth proportional to 100,478.72, 138,660.18 and 55,155.50 is: 76,114.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,478.72 : 138,660.18 = 55,155.50 : x
  2. Step 2: Convert to fraction form
    100,478.72/138,660.18 = 55,155.50/x
  3. Step 3: Cross multiply
    100,478.72x = 138,660.18 × 55,155.50
  4. Step 4: Simplify right side
    100,478.72x = 7,647,871,557.99
  5. Step 5: Solve for x
    x = 7,647,871,557.99/100,478.72
  6. Step 6: Final answer
    x = 76,114.34

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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.