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Finding the Fourth Proportional to 70,041.53, 105,063.01 and 20,121.50

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Solution

The fourth proportional to 70,041.53, 105,063.01 and 20,121.50 is: 30,182.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,041.53 : 105,063.01 = 20,121.50 : x
  2. Step 2: Convert to fraction form
    70,041.53/105,063.01 = 20,121.50/x
  3. Step 3: Cross multiply
    70,041.53x = 105,063.01 × 20,121.50
  4. Step 4: Simplify right side
    70,041.53x = 2,114,025,093.06
  5. Step 5: Solve for x
    x = 2,114,025,093.06/70,041.53
  6. Step 6: Final answer
    x = 30,182.45

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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.