Home / 91,986.85-137,980.28-28,811.91

Finding the Fourth Proportional to 91,986.85, 137,980.28 and 28,811.91

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Solution

The fourth proportional to 91,986.85, 137,980.28 and 28,811.91 is: 43,217.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,986.85 : 137,980.28 = 28,811.91 : x
  2. Step 2: Convert to fraction form
    91,986.85/137,980.28 = 28,811.91/x
  3. Step 3: Cross multiply
    91,986.85x = 137,980.28 × 28,811.91
  4. Step 4: Simplify right side
    91,986.85x = 3,975,475,409.13
  5. Step 5: Solve for x
    x = 3,975,475,409.13/91,986.85
  6. Step 6: Final answer
    x = 43,217.87

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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.