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Finding the Fourth Proportional to 666,553.91, 999,980.93 and 211,172.61

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Solution

The fourth proportional to 666,553.91, 999,980.93 and 211,172.61 is: 316,806.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,553.91 : 999,980.93 = 211,172.61 : x
  2. Step 2: Convert to fraction form
    666,553.91/999,980.93 = 211,172.61/x
  3. Step 3: Cross multiply
    666,553.91x = 999,980.93 × 211,172.61
  4. Step 4: Simplify right side
    666,553.91x = 211,168,577,938.42
  5. Step 5: Solve for x
    x = 211,168,577,938.42/666,553.91
  6. Step 6: Final answer
    x = 316,806.45

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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.