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Finding the Fourth Proportional to 512.42, 707.21 and 313.21

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Solution

The fourth proportional to 512.42, 707.21 and 313.21 is: 432.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.42 : 707.21 = 313.21 : x
  2. Step 2: Convert to fraction form
    512.42/707.21 = 313.21/x
  3. Step 3: Cross multiply
    512.42x = 707.21 × 313.21
  4. Step 4: Simplify right side
    512.42x = 221,505.24
  5. Step 5: Solve for x
    x = 221,505.24/512.42
  6. Step 6: Final answer
    x = 432.27

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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.