Home / 90,709.20-136,031.40-31,546.80

Finding the Fourth Proportional to 90,709.20, 136,031.40 and 31,546.80

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Solution

The fourth proportional to 90,709.20, 136,031.40 and 31,546.80 is: 47,308.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,709.20 : 136,031.40 = 31,546.80 : x
  2. Step 2: Convert to fraction form
    90,709.20/136,031.40 = 31,546.80/x
  3. Step 3: Cross multiply
    90,709.20x = 136,031.40 × 31,546.80
  4. Step 4: Simplify right side
    90,709.20x = 4,291,355,369.52
  5. Step 5: Solve for x
    x = 4,291,355,369.52/90,709.20
  6. Step 6: Final answer
    x = 47,308.93

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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.