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Finding the Fourth Proportional to 666.69, 992.99 and 631.99

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Solution

The fourth proportional to 666.69, 992.99 and 631.99 is: 941.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.69 : 992.99 = 631.99 : x
  2. Step 2: Convert to fraction form
    666.69/992.99 = 631.99/x
  3. Step 3: Cross multiply
    666.69x = 992.99 × 631.99
  4. Step 4: Simplify right side
    666.69x = 627,559.75
  5. Step 5: Solve for x
    x = 627,559.75/666.69
  6. Step 6: Final answer
    x = 941.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.