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Finding the Fourth Proportional to 218,766.60, 328,149.90 and 139,969.80

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Solution

The fourth proportional to 218,766.60, 328,149.90 and 139,969.80 is: 209,954.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,766.60 : 328,149.90 = 139,969.80 : x
  2. Step 2: Convert to fraction form
    218,766.60/328,149.90 = 139,969.80/x
  3. Step 3: Cross multiply
    218,766.60x = 328,149.90 × 139,969.80
  4. Step 4: Simplify right side
    218,766.60x = 45,931,075,873.02
  5. Step 5: Solve for x
    x = 45,931,075,873.02/218,766.60
  6. Step 6: Final answer
    x = 209,954.70

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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.