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Finding the Fourth Proportional to 727.63, 1,089.64 and 666.18

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Solution

The fourth proportional to 727.63, 1,089.64 and 666.18 is: 997.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.63 : 1,089.64 = 666.18 : x
  2. Step 2: Convert to fraction form
    727.63/1,089.64 = 666.18/x
  3. Step 3: Cross multiply
    727.63x = 1,089.64 × 666.18
  4. Step 4: Simplify right side
    727.63x = 725,897.21
  5. Step 5: Solve for x
    x = 725,897.21/727.63
  6. Step 6: Final answer
    x = 997.62

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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.