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Finding the Fourth Proportional to 70,659.16, 105,989.34 and 20,740.08

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Solution

The fourth proportional to 70,659.16, 105,989.34 and 20,740.08 is: 31,110.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,659.16 : 105,989.34 = 20,740.08 : x
  2. Step 2: Convert to fraction form
    70,659.16/105,989.34 = 20,740.08/x
  3. Step 3: Cross multiply
    70,659.16x = 105,989.34 × 20,740.08
  4. Step 4: Simplify right side
    70,659.16x = 2,198,227,390.75
  5. Step 5: Solve for x
    x = 2,198,227,390.75/70,659.16
  6. Step 6: Final answer
    x = 31,110.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.