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Finding the Fourth Proportional to 647.96, 893.82 and 386.06

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Solution

The fourth proportional to 647.96, 893.82 and 386.06 is: 532.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.96 : 893.82 = 386.06 : x
  2. Step 2: Convert to fraction form
    647.96/893.82 = 386.06/x
  3. Step 3: Cross multiply
    647.96x = 893.82 × 386.06
  4. Step 4: Simplify right side
    647.96x = 345,068.15
  5. Step 5: Solve for x
    x = 345,068.15/647.96
  6. Step 6: Final answer
    x = 532.55

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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.