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Finding the Fourth Proportional to 647.51, 893.68 and 385.58

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Solution

The fourth proportional to 647.51, 893.68 and 385.58 is: 532.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.51 : 893.68 = 385.58 : x
  2. Step 2: Convert to fraction form
    647.51/893.68 = 385.58/x
  3. Step 3: Cross multiply
    647.51x = 893.68 × 385.58
  4. Step 4: Simplify right side
    647.51x = 344,586.40
  5. Step 5: Solve for x
    x = 344,586.40/647.51
  6. Step 6: Final answer
    x = 532.18

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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.