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Finding the Fourth Proportional to 70,405.81, 105,608.91 and 20,487.11

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Solution

The fourth proportional to 70,405.81, 105,608.91 and 20,487.11 is: 30,730.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,405.81 : 105,608.91 = 20,487.11 : x
  2. Step 2: Convert to fraction form
    70,405.81/105,608.91 = 20,487.11/x
  3. Step 3: Cross multiply
    70,405.81x = 105,608.91 × 20,487.11
  4. Step 4: Simplify right side
    70,405.81x = 2,163,620,947.08
  5. Step 5: Solve for x
    x = 2,163,620,947.08/70,405.81
  6. Step 6: Final answer
    x = 30,730.72

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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.