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Finding the Fourth Proportional to 91,212.60, 136,805.22 and 28,875

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Solution

The fourth proportional to 91,212.60, 136,805.22 and 28,875 is: 43,308.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,212.60 : 136,805.22 = 28,875 : x
  2. Step 2: Convert to fraction form
    91,212.60/136,805.22 = 28,875/x
  3. Step 3: Cross multiply
    91,212.60x = 136,805.22 × 28,875
  4. Step 4: Simplify right side
    91,212.60x = 3,950,250,727.50
  5. Step 5: Solve for x
    x = 3,950,250,727.50/91,212.60
  6. Step 6: Final answer
    x = 43,308.17

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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.