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Finding the Fourth Proportional to 81,068.40, 121,343.40 and 57,740.40

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Solution

The fourth proportional to 81,068.40, 121,343.40 and 57,740.40 is: 86,425.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,068.40 : 121,343.40 = 57,740.40 : x
  2. Step 2: Convert to fraction form
    81,068.40/121,343.40 = 57,740.40/x
  3. Step 3: Cross multiply
    81,068.40x = 121,343.40 × 57,740.40
  4. Step 4: Simplify right side
    81,068.40x = 7,006,416,453.36
  5. Step 5: Solve for x
    x = 7,006,416,453.36/81,068.40
  6. Step 6: Final answer
    x = 86,425.99

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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.