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Finding the Fourth Proportional to 647.66, 893.45 and 411.90

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Solution

The fourth proportional to 647.66, 893.45 and 411.90 is: 568.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.66 : 893.45 = 411.90 : x
  2. Step 2: Convert to fraction form
    647.66/893.45 = 411.90/x
  3. Step 3: Cross multiply
    647.66x = 893.45 × 411.90
  4. Step 4: Simplify right side
    647.66x = 368,012.06
  5. Step 5: Solve for x
    x = 368,012.06/647.66
  6. Step 6: Final answer
    x = 568.22

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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.