Home / 31,920.80-47,881.20-20,861.60

Finding the Fourth Proportional to 31,920.80, 47,881.20 and 20,861.60

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Solution

The fourth proportional to 31,920.80, 47,881.20 and 20,861.60 is: 31,292.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,920.80 : 47,881.20 = 20,861.60 : x
  2. Step 2: Convert to fraction form
    31,920.80/47,881.20 = 20,861.60/x
  3. Step 3: Cross multiply
    31,920.80x = 47,881.20 × 20,861.60
  4. Step 4: Simplify right side
    31,920.80x = 998,878,441.92
  5. Step 5: Solve for x
    x = 998,878,441.92/31,920.80
  6. Step 6: Final answer
    x = 31,292.40

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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.