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Finding the Fourth Proportional to 659.79, 989.69 and 403.47

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Solution

The fourth proportional to 659.79, 989.69 and 403.47 is: 605.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.79 : 989.69 = 403.47 : x
  2. Step 2: Convert to fraction form
    659.79/989.69 = 403.47/x
  3. Step 3: Cross multiply
    659.79x = 989.69 × 403.47
  4. Step 4: Simplify right side
    659.79x = 399,308.21
  5. Step 5: Solve for x
    x = 399,308.21/659.79
  6. Step 6: Final answer
    x = 605.21

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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.