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Finding the Fourth Proportional to 661.94, 991.08 and 499.13

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Solution

The fourth proportional to 661.94, 991.08 and 499.13 is: 747.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.94 : 991.08 = 499.13 : x
  2. Step 2: Convert to fraction form
    661.94/991.08 = 499.13/x
  3. Step 3: Cross multiply
    661.94x = 991.08 × 499.13
  4. Step 4: Simplify right side
    661.94x = 494,677.76
  5. Step 5: Solve for x
    x = 494,677.76/661.94
  6. Step 6: Final answer
    x = 747.32

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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.