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Finding the Fourth Proportional to 399,878.79, 551,831.44 and 218,590.80

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Solution

The fourth proportional to 399,878.79, 551,831.44 and 218,590.80 is: 301,654.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,878.79 : 551,831.44 = 218,590.80 : x
  2. Step 2: Convert to fraction form
    399,878.79/551,831.44 = 218,590.80/x
  3. Step 3: Cross multiply
    399,878.79x = 551,831.44 × 218,590.80
  4. Step 4: Simplify right side
    399,878.79x = 120,625,275,934.75
  5. Step 5: Solve for x
    x = 120,625,275,934.75/399,878.79
  6. Step 6: Final answer
    x = 301,654.60

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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.