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Finding the Fourth Proportional to 997.27, 1,376.46 and 647.35

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Solution

The fourth proportional to 997.27, 1,376.46 and 647.35 is: 893.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.27 : 1,376.46 = 647.35 : x
  2. Step 2: Convert to fraction form
    997.27/1,376.46 = 647.35/x
  3. Step 3: Cross multiply
    997.27x = 1,376.46 × 647.35
  4. Step 4: Simplify right side
    997.27x = 891,041.26
  5. Step 5: Solve for x
    x = 891,041.26/997.27
  6. Step 6: Final answer
    x = 893.48

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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.