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Finding the Fourth Proportional to 715.05, 986.69 and 420.27

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Solution

The fourth proportional to 715.05, 986.69 and 420.27 is: 579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.05 : 986.69 = 420.27 : x
  2. Step 2: Convert to fraction form
    715.05/986.69 = 420.27/x
  3. Step 3: Cross multiply
    715.05x = 986.69 × 420.27
  4. Step 4: Simplify right side
    715.05x = 414,674.10
  5. Step 5: Solve for x
    x = 414,674.10/715.05
  6. Step 6: Final answer
    x = 579.92

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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.