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Finding the Fourth Proportional to 70,318.64, 105,460.68 and 20,388.08

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Solution

The fourth proportional to 70,318.64, 105,460.68 and 20,388.08 is: 30,577.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,318.64 : 105,460.68 = 20,388.08 : x
  2. Step 2: Convert to fraction form
    70,318.64/105,460.68 = 20,388.08/x
  3. Step 3: Cross multiply
    70,318.64x = 105,460.68 × 20,388.08
  4. Step 4: Simplify right side
    70,318.64x = 2,150,140,780.69
  5. Step 5: Solve for x
    x = 2,150,140,780.69/70,318.64
  6. Step 6: Final answer
    x = 30,577.11

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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.