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Finding the Fourth Proportional to 91,912.62, 137,987.00 and 70,866.03

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Solution

The fourth proportional to 91,912.62, 137,987.00 and 70,866.03 is: 106,390.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,912.62 : 137,987.00 = 70,866.03 : x
  2. Step 2: Convert to fraction form
    91,912.62/137,987.00 = 70,866.03/x
  3. Step 3: Cross multiply
    91,912.62x = 137,987.00 × 70,866.03
  4. Step 4: Simplify right side
    91,912.62x = 9,778,590,182.31
  5. Step 5: Solve for x
    x = 9,778,590,182.31/91,912.62
  6. Step 6: Final answer
    x = 106,390.07

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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.