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Finding the Fourth Proportional to 688.15, 1,032.09 and 399.25

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Solution

The fourth proportional to 688.15, 1,032.09 and 399.25 is: 598.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.15 : 1,032.09 = 399.25 : x
  2. Step 2: Convert to fraction form
    688.15/1,032.09 = 399.25/x
  3. Step 3: Cross multiply
    688.15x = 1,032.09 × 399.25
  4. Step 4: Simplify right side
    688.15x = 412,061.93
  5. Step 5: Solve for x
    x = 412,061.93/688.15
  6. Step 6: Final answer
    x = 598.80

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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.