Home / 91,981.20-137,971.80-47,621.55

Finding the Fourth Proportional to 91,981.20, 137,971.80 and 47,621.55

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Solution

The fourth proportional to 91,981.20, 137,971.80 and 47,621.55 is: 71,432.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,981.20 : 137,971.80 = 47,621.55 : x
  2. Step 2: Convert to fraction form
    91,981.20/137,971.80 = 47,621.55/x
  3. Step 3: Cross multiply
    91,981.20x = 137,971.80 × 47,621.55
  4. Step 4: Simplify right side
    91,981.20x = 6,570,430,972.29
  5. Step 5: Solve for x
    x = 6,570,430,972.29/91,981.20
  6. Step 6: Final answer
    x = 71,432.33

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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.