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Finding the Fourth Proportional to 647.81, 893.96 and 395.66

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Solution

The fourth proportional to 647.81, 893.96 and 395.66 is: 545.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.81 : 893.96 = 395.66 : x
  2. Step 2: Convert to fraction form
    647.81/893.96 = 395.66/x
  3. Step 3: Cross multiply
    647.81x = 893.96 × 395.66
  4. Step 4: Simplify right side
    647.81x = 353,697.77
  5. Step 5: Solve for x
    x = 353,697.77/647.81
  6. Step 6: Final answer
    x = 545.99

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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.