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Finding the Fourth Proportional to 661.99, 993.36 and 402.51

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Solution

The fourth proportional to 661.99, 993.36 and 402.51 is: 603.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.99 : 993.36 = 402.51 : x
  2. Step 2: Convert to fraction form
    661.99/993.36 = 402.51/x
  3. Step 3: Cross multiply
    661.99x = 993.36 × 402.51
  4. Step 4: Simplify right side
    661.99x = 399,837.33
  5. Step 5: Solve for x
    x = 399,837.33/661.99
  6. Step 6: Final answer
    x = 603.99

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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.