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Finding the Fourth Proportional to 72,649.16, 108,979.99 and 20,058.64

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Solution

The fourth proportional to 72,649.16, 108,979.99 and 20,058.64 is: 30,089.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,649.16 : 108,979.99 = 20,058.64 : x
  2. Step 2: Convert to fraction form
    72,649.16/108,979.99 = 20,058.64/x
  3. Step 3: Cross multiply
    72,649.16x = 108,979.99 × 20,058.64
  4. Step 4: Simplify right side
    72,649.16x = 2,185,990,064.02
  5. Step 5: Solve for x
    x = 2,185,990,064.02/72,649.16
  6. Step 6: Final answer
    x = 30,089.68

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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.