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Finding the Fourth Proportional to 687.84, 946.56 and 576

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Solution

The fourth proportional to 687.84, 946.56 and 576 is: 792.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.84 : 946.56 = 576 : x
  2. Step 2: Convert to fraction form
    687.84/946.56 = 576/x
  3. Step 3: Cross multiply
    687.84x = 946.56 × 576
  4. Step 4: Simplify right side
    687.84x = 545,218.56
  5. Step 5: Solve for x
    x = 545,218.56/687.84
  6. Step 6: Final answer
    x = 792.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.