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Finding the Fourth Proportional to 399,352.80, 551,129.36 and 218,081.60

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Solution

The fourth proportional to 399,352.80, 551,129.36 and 218,081.60 is: 300,964.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,352.80 : 551,129.36 = 218,081.60 : x
  2. Step 2: Convert to fraction form
    399,352.80/551,129.36 = 218,081.60/x
  3. Step 3: Cross multiply
    399,352.80x = 551,129.36 × 218,081.60
  4. Step 4: Simplify right side
    399,352.80x = 120,191,172,635.78
  5. Step 5: Solve for x
    x = 120,191,172,635.78/399,352.80
  6. Step 6: Final answer
    x = 300,964.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.