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Finding the Fourth Proportional to 218,910.60, 328,365.90 and 61,138.80

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Solution

The fourth proportional to 218,910.60, 328,365.90 and 61,138.80 is: 91,708.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,910.60 : 328,365.90 = 61,138.80 : x
  2. Step 2: Convert to fraction form
    218,910.60/328,365.90 = 61,138.80/x
  3. Step 3: Cross multiply
    218,910.60x = 328,365.90 × 61,138.80
  4. Step 4: Simplify right side
    218,910.60x = 20,075,897,086.92
  5. Step 5: Solve for x
    x = 20,075,897,086.92/218,910.60
  6. Step 6: Final answer
    x = 91,708.20

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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.