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Finding the Fourth Proportional to 647.45, 971.13 and 442.43

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Solution

The fourth proportional to 647.45, 971.13 and 442.43 is: 663.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.45 : 971.13 = 442.43 : x
  2. Step 2: Convert to fraction form
    647.45/971.13 = 442.43/x
  3. Step 3: Cross multiply
    647.45x = 971.13 × 442.43
  4. Step 4: Simplify right side
    647.45x = 429,657.05
  5. Step 5: Solve for x
    x = 429,657.05/647.45
  6. Step 6: Final answer
    x = 663.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.