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Finding the Fourth Proportional to 217,421.60, 326,132.40 and 77,194.40

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Solution

The fourth proportional to 217,421.60, 326,132.40 and 77,194.40 is: 115,791.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,421.60 : 326,132.40 = 77,194.40 : x
  2. Step 2: Convert to fraction form
    217,421.60/326,132.40 = 77,194.40/x
  3. Step 3: Cross multiply
    217,421.60x = 326,132.40 × 77,194.40
  4. Step 4: Simplify right side
    217,421.60x = 25,175,594,938.56
  5. Step 5: Solve for x
    x = 25,175,594,938.56/217,421.60
  6. Step 6: Final answer
    x = 115,791.60

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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.