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Finding the Fourth Proportional to 72,389.97, 99,900.91 and 40,557.78

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Solution

The fourth proportional to 72,389.97, 99,900.91 and 40,557.78 is: 55,971.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,389.97 : 99,900.91 = 40,557.78 : x
  2. Step 2: Convert to fraction form
    72,389.97/99,900.91 = 40,557.78/x
  3. Step 3: Cross multiply
    72,389.97x = 99,900.91 × 40,557.78
  4. Step 4: Simplify right side
    72,389.97x = 4,051,759,129.58
  5. Step 5: Solve for x
    x = 4,051,759,129.58/72,389.97
  6. Step 6: Final answer
    x = 55,971.28

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1.5x scale

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.