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Finding the Fourth Proportional to 90,730, 125,207.40 and 50,986

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Solution

The fourth proportional to 90,730, 125,207.40 and 50,986 is: 70,360.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,730 : 125,207.40 = 50,986 : x
  2. Step 2: Convert to fraction form
    90,730/125,207.40 = 50,986/x
  3. Step 3: Cross multiply
    90,730x = 125,207.40 × 50,986
  4. Step 4: Simplify right side
    90,730x = 6,383,824,496.40
  5. Step 5: Solve for x
    x = 6,383,824,496.40/90,730
  6. Step 6: Final answer
    x = 70,360.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.