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Finding the Fourth Proportional to 40,920.40, 61,380.60 and 13,221.20

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Solution

The fourth proportional to 40,920.40, 61,380.60 and 13,221.20 is: 19,831.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,920.40 : 61,380.60 = 13,221.20 : x
  2. Step 2: Convert to fraction form
    40,920.40/61,380.60 = 13,221.20/x
  3. Step 3: Cross multiply
    40,920.40x = 61,380.60 × 13,221.20
  4. Step 4: Simplify right side
    40,920.40x = 811,525,188.72
  5. Step 5: Solve for x
    x = 811,525,188.72/40,920.40
  6. Step 6: Final answer
    x = 19,831.80

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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.