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Finding the Fourth Proportional to 81,007.88, 120,925.78 and 69,985.40

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Solution

The fourth proportional to 81,007.88, 120,925.78 and 69,985.40 is: 104,471.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,007.88 : 120,925.78 = 69,985.40 : x
  2. Step 2: Convert to fraction form
    81,007.88/120,925.78 = 69,985.40/x
  3. Step 3: Cross multiply
    81,007.88x = 120,925.78 × 69,985.40
  4. Step 4: Simplify right side
    81,007.88x = 8,463,039,083.61
  5. Step 5: Solve for x
    x = 8,463,039,083.61/81,007.88
  6. Step 6: Final answer
    x = 104,471.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.