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Finding the Fourth Proportional to 60,665.60, 90,998.40 and 21,218.60

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Solution

The fourth proportional to 60,665.60, 90,998.40 and 21,218.60 is: 31,827.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,665.60 : 90,998.40 = 21,218.60 : x
  2. Step 2: Convert to fraction form
    60,665.60/90,998.40 = 21,218.60/x
  3. Step 3: Cross multiply
    60,665.60x = 90,998.40 × 21,218.60
  4. Step 4: Simplify right side
    60,665.60x = 1,930,858,650.24
  5. Step 5: Solve for x
    x = 1,930,858,650.24/60,665.60
  6. Step 6: Final answer
    x = 31,827.90

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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.