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Finding the Fourth Proportional to 72,389.86, 99,902.09 and 40,569.01

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Solution

The fourth proportional to 72,389.86, 99,902.09 and 40,569.01 is: 55,987.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,389.86 : 99,902.09 = 40,569.01 : x
  2. Step 2: Convert to fraction form
    72,389.86/99,902.09 = 40,569.01/x
  3. Step 3: Cross multiply
    72,389.86x = 99,902.09 × 40,569.01
  4. Step 4: Simplify right side
    72,389.86x = 4,052,928,888.23
  5. Step 5: Solve for x
    x = 4,052,928,888.23/72,389.86
  6. Step 6: Final answer
    x = 55,987.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.