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Finding the Fourth Proportional to 70,821.76, 106,220.76 and 20,900.92

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Solution

The fourth proportional to 70,821.76, 106,220.76 and 20,900.92 is: 31,347.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,821.76 : 106,220.76 = 20,900.92 : x
  2. Step 2: Convert to fraction form
    70,821.76/106,220.76 = 20,900.92/x
  3. Step 3: Cross multiply
    70,821.76x = 106,220.76 × 20,900.92
  4. Step 4: Simplify right side
    70,821.76x = 2,220,111,607.10
  5. Step 5: Solve for x
    x = 2,220,111,607.10/70,821.76
  6. Step 6: Final answer
    x = 31,347.87

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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.