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Finding the Fourth Proportional to 90,909.76, 136,361.40 and 31,745.20

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Solution

The fourth proportional to 90,909.76, 136,361.40 and 31,745.20 is: 47,616.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,909.76 : 136,361.40 = 31,745.20 : x
  2. Step 2: Convert to fraction form
    90,909.76/136,361.40 = 31,745.20/x
  3. Step 3: Cross multiply
    90,909.76x = 136,361.40 × 31,745.20
  4. Step 4: Simplify right side
    90,909.76x = 4,328,819,915.28
  5. Step 5: Solve for x
    x = 4,328,819,915.28/90,909.76
  6. Step 6: Final answer
    x = 47,616.67

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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.