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Finding the Fourth Proportional to 40,920.60, 61,380.90 and 13,218.60

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Solution

The fourth proportional to 40,920.60, 61,380.90 and 13,218.60 is: 19,827.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,920.60 : 61,380.90 = 13,218.60 : x
  2. Step 2: Convert to fraction form
    40,920.60/61,380.90 = 13,218.60/x
  3. Step 3: Cross multiply
    40,920.60x = 61,380.90 × 13,218.60
  4. Step 4: Simplify right side
    40,920.60x = 811,369,564.74
  5. Step 5: Solve for x
    x = 811,369,564.74/40,920.60
  6. Step 6: Final answer
    x = 19,827.90

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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.