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Finding the Fourth Proportional to 718.03, 993.05 and 644.32

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Solution

The fourth proportional to 718.03, 993.05 and 644.32 is: 891.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.03 : 993.05 = 644.32 : x
  2. Step 2: Convert to fraction form
    718.03/993.05 = 644.32/x
  3. Step 3: Cross multiply
    718.03x = 993.05 × 644.32
  4. Step 4: Simplify right side
    718.03x = 639,841.98
  5. Step 5: Solve for x
    x = 639,841.98/718.03
  6. Step 6: Final answer
    x = 891.11

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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.