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Finding the Fourth Proportional to 91,346.40, 137,019.60 and 66,268.80

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Solution

The fourth proportional to 91,346.40, 137,019.60 and 66,268.80 is: 99,403.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,346.40 : 137,019.60 = 66,268.80 : x
  2. Step 2: Convert to fraction form
    91,346.40/137,019.60 = 66,268.80/x
  3. Step 3: Cross multiply
    91,346.40x = 137,019.60 × 66,268.80
  4. Step 4: Simplify right side
    91,346.40x = 9,080,124,468.48
  5. Step 5: Solve for x
    x = 9,080,124,468.48/91,346.40
  6. Step 6: Final answer
    x = 99,403.20

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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.