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Finding the Fourth Proportional to 715.16, 987.05 and 416.39

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Solution

The fourth proportional to 715.16, 987.05 and 416.39 is: 574.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.16 : 987.05 = 416.39 : x
  2. Step 2: Convert to fraction form
    715.16/987.05 = 416.39/x
  3. Step 3: Cross multiply
    715.16x = 987.05 × 416.39
  4. Step 4: Simplify right side
    715.16x = 410,993.86
  5. Step 5: Solve for x
    x = 410,993.86/715.16
  6. Step 6: Final answer
    x = 574.69

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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.