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Finding the Fourth Proportional to 90,969.40, 136,287.84 and 65,947.42

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Solution

The fourth proportional to 90,969.40, 136,287.84 and 65,947.42 is: 98,800.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,969.40 : 136,287.84 = 65,947.42 : x
  2. Step 2: Convert to fraction form
    90,969.40/136,287.84 = 65,947.42/x
  3. Step 3: Cross multiply
    90,969.40x = 136,287.84 × 65,947.42
  4. Step 4: Simplify right side
    90,969.40x = 8,987,831,425.37
  5. Step 5: Solve for x
    x = 8,987,831,425.37/90,969.40
  6. Step 6: Final answer
    x = 98,800.60

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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.