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Finding the Fourth Proportional to 70,362.45, 105,549.21 and 20,443.41

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Solution

The fourth proportional to 70,362.45, 105,549.21 and 20,443.41 is: 30,666.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,362.45 : 105,549.21 = 20,443.41 : x
  2. Step 2: Convert to fraction form
    70,362.45/105,549.21 = 20,443.41/x
  3. Step 3: Cross multiply
    70,362.45x = 105,549.21 × 20,443.41
  4. Step 4: Simplify right side
    70,362.45x = 2,157,785,775.21
  5. Step 5: Solve for x
    x = 2,157,785,775.21/70,362.45
  6. Step 6: Final answer
    x = 30,666.72

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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.