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Finding the Fourth Proportional to 666.15, 997.95 and 357.90

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Solution

The fourth proportional to 666.15, 997.95 and 357.90 is: 536.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.15 : 997.95 = 357.90 : x
  2. Step 2: Convert to fraction form
    666.15/997.95 = 357.90/x
  3. Step 3: Cross multiply
    666.15x = 997.95 × 357.90
  4. Step 4: Simplify right side
    666.15x = 357,166.31
  5. Step 5: Solve for x
    x = 357,166.31/666.15
  6. Step 6: Final answer
    x = 536.16

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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.