Home / 91,142.28-136,712.60-28,812.80

Finding the Fourth Proportional to 91,142.28, 136,712.60 and 28,812.80

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Solution

The fourth proportional to 91,142.28, 136,712.60 and 28,812.80 is: 43,218.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,142.28 : 136,712.60 = 28,812.80 : x
  2. Step 2: Convert to fraction form
    91,142.28/136,712.60 = 28,812.80/x
  3. Step 3: Cross multiply
    91,142.28x = 136,712.60 × 28,812.80
  4. Step 4: Simplify right side
    91,142.28x = 3,939,072,801.28
  5. Step 5: Solve for x
    x = 3,939,072,801.28/91,142.28
  6. Step 6: Final answer
    x = 43,218.94

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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.