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Finding the Fourth Proportional to 665.90, 997.22 and 392.06

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Solution

The fourth proportional to 665.90, 997.22 and 392.06 is: 587.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.90 : 997.22 = 392.06 : x
  2. Step 2: Convert to fraction form
    665.90/997.22 = 392.06/x
  3. Step 3: Cross multiply
    665.90x = 997.22 × 392.06
  4. Step 4: Simplify right side
    665.90x = 390,970.07
  5. Step 5: Solve for x
    x = 390,970.07/665.90
  6. Step 6: Final answer
    x = 587.13

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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.