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Finding the Fourth Proportional to 688.69, 1,027.99 and 606.66

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Solution

The fourth proportional to 688.69, 1,027.99 and 606.66 is: 905.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.69 : 1,027.99 = 606.66 : x
  2. Step 2: Convert to fraction form
    688.69/1,027.99 = 606.66/x
  3. Step 3: Cross multiply
    688.69x = 1,027.99 × 606.66
  4. Step 4: Simplify right side
    688.69x = 623,640.41
  5. Step 5: Solve for x
    x = 623,640.41/688.69
  6. Step 6: Final answer
    x = 905.55

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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.