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Finding the Fourth Proportional to 91,915.91, 137,450.59 and 87,431.87

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Solution

The fourth proportional to 91,915.91, 137,450.59 and 87,431.87 is: 130,745.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,915.91 : 137,450.59 = 87,431.87 : x
  2. Step 2: Convert to fraction form
    91,915.91/137,450.59 = 87,431.87/x
  3. Step 3: Cross multiply
    91,915.91x = 137,450.59 × 87,431.87
  4. Step 4: Simplify right side
    91,915.91x = 12,017,562,459.93
  5. Step 5: Solve for x
    x = 12,017,562,459.93/91,915.91
  6. Step 6: Final answer
    x = 130,745.19

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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.