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Finding the Fourth Proportional to 64,790.73, 97,190.15 and 20,419.20

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Solution

The fourth proportional to 64,790.73, 97,190.15 and 20,419.20 is: 30,630.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,790.73 : 97,190.15 = 20,419.20 : x
  2. Step 2: Convert to fraction form
    64,790.73/97,190.15 = 20,419.20/x
  3. Step 3: Cross multiply
    64,790.73x = 97,190.15 × 20,419.20
  4. Step 4: Simplify right side
    64,790.73x = 1,984,545,008.78
  5. Step 5: Solve for x
    x = 1,984,545,008.78/64,790.73
  6. Step 6: Final answer
    x = 30,630.08

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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.