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Finding the Fourth Proportional to 715.10, 986.72 and 400.37

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Solution

The fourth proportional to 715.10, 986.72 and 400.37 is: 552.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.10 : 986.72 = 400.37 : x
  2. Step 2: Convert to fraction form
    715.10/986.72 = 400.37/x
  3. Step 3: Cross multiply
    715.10x = 986.72 × 400.37
  4. Step 4: Simplify right side
    715.10x = 395,046.15
  5. Step 5: Solve for x
    x = 395,046.15/715.10
  6. Step 6: Final answer
    x = 552.44

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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.