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Finding the Fourth Proportional to 91,447.80, 137,171.70 and 90,864.60

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Solution

The fourth proportional to 91,447.80, 137,171.70 and 90,864.60 is: 136,296.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,447.80 : 137,171.70 = 90,864.60 : x
  2. Step 2: Convert to fraction form
    91,447.80/137,171.70 = 90,864.60/x
  3. Step 3: Cross multiply
    91,447.80x = 137,171.70 × 90,864.60
  4. Step 4: Simplify right side
    91,447.80x = 12,464,051,651.82
  5. Step 5: Solve for x
    x = 12,464,051,651.82/91,447.80
  6. Step 6: Final answer
    x = 136,296.90

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1.5x scale

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.