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Finding the Fourth Proportional to 136,959.40, 205,439.10 and 91,858.60

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Solution

The fourth proportional to 136,959.40, 205,439.10 and 91,858.60 is: 137,787.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,959.40 : 205,439.10 = 91,858.60 : x
  2. Step 2: Convert to fraction form
    136,959.40/205,439.10 = 91,858.60/x
  3. Step 3: Cross multiply
    136,959.40x = 205,439.10 × 91,858.60
  4. Step 4: Simplify right side
    136,959.40x = 18,871,348,111.26
  5. Step 5: Solve for x
    x = 18,871,348,111.26/136,959.40
  6. Step 6: Final answer
    x = 137,787.90

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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.