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Finding the Fourth Proportional to 715.05, 986.72 and 400.26

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Solution

The fourth proportional to 715.05, 986.72 and 400.26 is: 552.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.05 : 986.72 = 400.26 : x
  2. Step 2: Convert to fraction form
    715.05/986.72 = 400.26/x
  3. Step 3: Cross multiply
    715.05x = 986.72 × 400.26
  4. Step 4: Simplify right side
    715.05x = 394,944.55
  5. Step 5: Solve for x
    x = 394,944.55/715.05
  6. Step 6: Final answer
    x = 552.33

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1.5x scale

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.