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Finding the Fourth Proportional to 715.19, 986.63 and 420.26

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Solution

The fourth proportional to 715.19, 986.63 and 420.26 is: 579.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.19 : 986.63 = 420.26 : x
  2. Step 2: Convert to fraction form
    715.19/986.63 = 420.26/x
  3. Step 3: Cross multiply
    715.19x = 986.63 × 420.26
  4. Step 4: Simplify right side
    715.19x = 414,634.09
  5. Step 5: Solve for x
    x = 414,634.09/715.19
  6. Step 6: Final answer
    x = 579.76

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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.