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Finding the Fourth Proportional to 81,267.90, 121,858.01 and 36,870.42

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Solution

The fourth proportional to 81,267.90, 121,858.01 and 36,870.42 is: 55,285.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,267.90 : 121,858.01 = 36,870.42 : x
  2. Step 2: Convert to fraction form
    81,267.90/121,858.01 = 36,870.42/x
  3. Step 3: Cross multiply
    81,267.90x = 121,858.01 × 36,870.42
  4. Step 4: Simplify right side
    81,267.90x = 4,492,956,009.06
  5. Step 5: Solve for x
    x = 4,492,956,009.06/81,267.90
  6. Step 6: Final answer
    x = 55,285.74

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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.