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Finding the Fourth Proportional to 218,820.80, 328,231.20 and 217,438.40

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Solution

The fourth proportional to 218,820.80, 328,231.20 and 217,438.40 is: 326,157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,820.80 : 328,231.20 = 217,438.40 : x
  2. Step 2: Convert to fraction form
    218,820.80/328,231.20 = 217,438.40/x
  3. Step 3: Cross multiply
    218,820.80x = 328,231.20 × 217,438.40
  4. Step 4: Simplify right side
    218,820.80x = 71,370,066,958.08
  5. Step 5: Solve for x
    x = 71,370,066,958.08/218,820.80
  6. Step 6: Final answer
    x = 326,157.60

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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.