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Finding the Fourth Proportional to 647.80, 893.87 and 385.72

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Solution

The fourth proportional to 647.80, 893.87 and 385.72 is: 532.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.80 : 893.87 = 385.72 : x
  2. Step 2: Convert to fraction form
    647.80/893.87 = 385.72/x
  3. Step 3: Cross multiply
    647.80x = 893.87 × 385.72
  4. Step 4: Simplify right side
    647.80x = 344,780.82
  5. Step 5: Solve for x
    x = 344,780.82/647.80
  6. Step 6: Final answer
    x = 532.24

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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.