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Finding the Fourth Proportional to 91,818.70, 137,533.65 and 81,969.10

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Solution

The fourth proportional to 91,818.70, 137,533.65 and 81,969.10 is: 122,780.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,818.70 : 137,533.65 = 81,969.10 : x
  2. Step 2: Convert to fraction form
    91,818.70/137,533.65 = 81,969.10/x
  3. Step 3: Cross multiply
    91,818.70x = 137,533.65 × 81,969.10
  4. Step 4: Simplify right side
    91,818.70x = 11,273,509,510.22
  5. Step 5: Solve for x
    x = 11,273,509,510.22/91,818.70
  6. Step 6: Final answer
    x = 122,780.10

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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.