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Finding the Fourth Proportional to 715.01, 986.74 and 400.29

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Solution

The fourth proportional to 715.01, 986.74 and 400.29 is: 552.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.01 : 986.74 = 400.29 : x
  2. Step 2: Convert to fraction form
    715.01/986.74 = 400.29/x
  3. Step 3: Cross multiply
    715.01x = 986.74 × 400.29
  4. Step 4: Simplify right side
    715.01x = 394,975.22
  5. Step 5: Solve for x
    x = 394,975.22/715.01
  6. Step 6: Final answer
    x = 552.41

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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.