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Finding the Fourth Proportional to 715.26, 986.66 and 420.48

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Solution

The fourth proportional to 715.26, 986.66 and 420.48 is: 580.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.26 : 986.66 = 420.48 : x
  2. Step 2: Convert to fraction form
    715.26/986.66 = 420.48/x
  3. Step 3: Cross multiply
    715.26x = 986.66 × 420.48
  4. Step 4: Simplify right side
    715.26x = 414,870.80
  5. Step 5: Solve for x
    x = 414,870.80/715.26
  6. Step 6: Final answer
    x = 580.03

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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.