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Finding the Fourth Proportional to 399,398.40, 551,187.36 and 229,688.64

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Solution

The fourth proportional to 399,398.40, 551,187.36 and 229,688.64 is: 316,980.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,398.40 : 551,187.36 = 229,688.64 : x
  2. Step 2: Convert to fraction form
    399,398.40/551,187.36 = 229,688.64/x
  3. Step 3: Cross multiply
    399,398.40x = 551,187.36 × 229,688.64
  4. Step 4: Simplify right side
    399,398.40x = 126,601,475,103.59
  5. Step 5: Solve for x
    x = 126,601,475,103.59/399,398.40
  6. Step 6: Final answer
    x = 316,980.43

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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.