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Finding the Fourth Proportional to 672.85, 929.69 and 556.21

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Solution

The fourth proportional to 672.85, 929.69 and 556.21 is: 768.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.85 : 929.69 = 556.21 : x
  2. Step 2: Convert to fraction form
    672.85/929.69 = 556.21/x
  3. Step 3: Cross multiply
    672.85x = 929.69 × 556.21
  4. Step 4: Simplify right side
    672.85x = 517,102.87
  5. Step 5: Solve for x
    x = 517,102.87/672.85
  6. Step 6: Final answer
    x = 768.53

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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.