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Finding the Fourth Proportional to 687.84, 1,032.24 and 302.88

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Solution

The fourth proportional to 687.84, 1,032.24 and 302.88 is: 454.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.84 : 1,032.24 = 302.88 : x
  2. Step 2: Convert to fraction form
    687.84/1,032.24 = 302.88/x
  3. Step 3: Cross multiply
    687.84x = 1,032.24 × 302.88
  4. Step 4: Simplify right side
    687.84x = 312,644.85
  5. Step 5: Solve for x
    x = 312,644.85/687.84
  6. Step 6: Final answer
    x = 454.53

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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.