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Finding the Fourth Proportional to 70,830.40, 106,245.60 and 20,911.18

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Solution

The fourth proportional to 70,830.40, 106,245.60 and 20,911.18 is: 31,366.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,830.40 : 106,245.60 = 20,911.18 : x
  2. Step 2: Convert to fraction form
    70,830.40/106,245.60 = 20,911.18/x
  3. Step 3: Cross multiply
    70,830.40x = 106,245.60 × 20,911.18
  4. Step 4: Simplify right side
    70,830.40x = 2,221,720,865.81
  5. Step 5: Solve for x
    x = 2,221,720,865.81/70,830.40
  6. Step 6: Final answer
    x = 31,366.77

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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.