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Finding the Fourth Proportional to 90,759, 136,143.36 and 28,434.36

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Solution

The fourth proportional to 90,759, 136,143.36 and 28,434.36 is: 42,653.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,759 : 136,143.36 = 28,434.36 : x
  2. Step 2: Convert to fraction form
    90,759/136,143.36 = 28,434.36/x
  3. Step 3: Cross multiply
    90,759x = 136,143.36 × 28,434.36
  4. Step 4: Simplify right side
    90,759x = 3,871,149,309.85
  5. Step 5: Solve for x
    x = 3,871,149,309.85/90,759
  6. Step 6: Final answer
    x = 42,653.06

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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.