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Finding the Fourth Proportional to 399,710.26, 551,601.60 and 218,422.20

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Solution

The fourth proportional to 399,710.26, 551,601.60 and 218,422.20 is: 301,423.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,710.26 : 551,601.60 = 218,422.20 : x
  2. Step 2: Convert to fraction form
    399,710.26/551,601.60 = 218,422.20/x
  3. Step 3: Cross multiply
    399,710.26x = 551,601.60 × 218,422.20
  4. Step 4: Simplify right side
    399,710.26x = 120,482,034,995.52
  5. Step 5: Solve for x
    x = 120,482,034,995.52/399,710.26
  6. Step 6: Final answer
    x = 301,423.42

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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.