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Finding the Fourth Proportional to 91,912.82, 137,987.29 and 70,866.23

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Solution

The fourth proportional to 91,912.82, 137,987.29 and 70,866.23 is: 106,390.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,912.82 : 137,987.29 = 70,866.23 : x
  2. Step 2: Convert to fraction form
    91,912.82/137,987.29 = 70,866.23/x
  3. Step 3: Cross multiply
    91,912.82x = 137,987.29 × 70,866.23
  4. Step 4: Simplify right side
    91,912.82x = 9,778,638,428.86
  5. Step 5: Solve for x
    x = 9,778,638,428.86/91,912.82
  6. Step 6: Final answer
    x = 106,390.37

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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.