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Finding the Fourth Proportional to 688.21, 1,032.30 and 277.05

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Solution

The fourth proportional to 688.21, 1,032.30 and 277.05 is: 415.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.21 : 1,032.30 = 277.05 : x
  2. Step 2: Convert to fraction form
    688.21/1,032.30 = 277.05/x
  3. Step 3: Cross multiply
    688.21x = 1,032.30 × 277.05
  4. Step 4: Simplify right side
    688.21x = 285,998.72
  5. Step 5: Solve for x
    x = 285,998.72/688.21
  6. Step 6: Final answer
    x = 415.57

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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.