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Finding the Fourth Proportional to 91,864.40, 137,796.60 and 85,643.60

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Solution

The fourth proportional to 91,864.40, 137,796.60 and 85,643.60 is: 128,465.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,864.40 : 137,796.60 = 85,643.60 : x
  2. Step 2: Convert to fraction form
    91,864.40/137,796.60 = 85,643.60/x
  3. Step 3: Cross multiply
    91,864.40x = 137,796.60 × 85,643.60
  4. Step 4: Simplify right side
    91,864.40x = 11,801,396,891.76
  5. Step 5: Solve for x
    x = 11,801,396,891.76/91,864.40
  6. Step 6: Final answer
    x = 128,465.40

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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.