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Finding the Fourth Proportional to 661.98, 992.98 and 315.35

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Solution

The fourth proportional to 661.98, 992.98 and 315.35 is: 473.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.98 : 992.98 = 315.35 : x
  2. Step 2: Convert to fraction form
    661.98/992.98 = 315.35/x
  3. Step 3: Cross multiply
    661.98x = 992.98 × 315.35
  4. Step 4: Simplify right side
    661.98x = 313,136.24
  5. Step 5: Solve for x
    x = 313,136.24/661.98
  6. Step 6: Final answer
    x = 473.03

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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.