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Finding the Fourth Proportional to 72,294.02, 108,428.73 and 19,691.20

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Solution

The fourth proportional to 72,294.02, 108,428.73 and 19,691.20 is: 29,533.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,294.02 : 108,428.73 = 19,691.20 : x
  2. Step 2: Convert to fraction form
    72,294.02/108,428.73 = 19,691.20/x
  3. Step 3: Cross multiply
    72,294.02x = 108,428.73 × 19,691.20
  4. Step 4: Simplify right side
    72,294.02x = 2,135,091,869.87
  5. Step 5: Solve for x
    x = 2,135,091,869.87/72,294.02
  6. Step 6: Final answer
    x = 29,533.45

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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.