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Finding the Fourth Proportional to 70,236.98, 105,339.87 and 20,306.18

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Solution

The fourth proportional to 70,236.98, 105,339.87 and 20,306.18 is: 30,454.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,236.98 : 105,339.87 = 20,306.18 : x
  2. Step 2: Convert to fraction form
    70,236.98/105,339.87 = 20,306.18/x
  3. Step 3: Cross multiply
    70,236.98x = 105,339.87 × 20,306.18
  4. Step 4: Simplify right side
    70,236.98x = 2,139,050,361.40
  5. Step 5: Solve for x
    x = 2,139,050,361.40/70,236.98
  6. Step 6: Final answer
    x = 30,454.76

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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.