Home / 99,915.21-149,143.92-87,303.75

Finding the Fourth Proportional to 99,915.21, 149,143.92 and 87,303.75

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Solution

The fourth proportional to 99,915.21, 149,143.92 and 87,303.75 is: 130,318.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,915.21 : 149,143.92 = 87,303.75 : x
  2. Step 2: Convert to fraction form
    99,915.21/149,143.92 = 87,303.75/x
  3. Step 3: Cross multiply
    99,915.21x = 149,143.92 × 87,303.75
  4. Step 4: Simplify right side
    99,915.21x = 13,020,823,505.70
  5. Step 5: Solve for x
    x = 13,020,823,505.70/99,915.21
  6. Step 6: Final answer
    x = 130,318.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.