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Finding the Fourth Proportional to 661.26, 912.69 and 427.98

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Solution

The fourth proportional to 661.26, 912.69 and 427.98 is: 590.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.26 : 912.69 = 427.98 : x
  2. Step 2: Convert to fraction form
    661.26/912.69 = 427.98/x
  3. Step 3: Cross multiply
    661.26x = 912.69 × 427.98
  4. Step 4: Simplify right side
    661.26x = 390,613.07
  5. Step 5: Solve for x
    x = 390,613.07/661.26
  6. Step 6: Final answer
    x = 590.71

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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.