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Finding the Fourth Proportional to 666,553.16, 999,979.81 and 211,171.86

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Solution

The fourth proportional to 666,553.16, 999,979.81 and 211,171.86 is: 316,805.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,553.16 : 999,979.81 = 211,171.86 : x
  2. Step 2: Convert to fraction form
    666,553.16/999,979.81 = 211,171.86/x
  3. Step 3: Cross multiply
    666,553.16x = 999,979.81 × 211,171.86
  4. Step 4: Simplify right side
    666,553.16x = 211,167,590,384.39
  5. Step 5: Solve for x
    x = 211,167,590,384.39/666,553.16
  6. Step 6: Final answer
    x = 316,805.32

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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.