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Finding the Fourth Proportional to 715.87, 988.07 and 417.05

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Solution

The fourth proportional to 715.87, 988.07 and 417.05 is: 575.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.87 : 988.07 = 417.05 : x
  2. Step 2: Convert to fraction form
    715.87/988.07 = 417.05/x
  3. Step 3: Cross multiply
    715.87x = 988.07 × 417.05
  4. Step 4: Simplify right side
    715.87x = 412,074.59
  5. Step 5: Solve for x
    x = 412,074.59/715.87
  6. Step 6: Final answer
    x = 575.63

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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.