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Finding the Fourth Proportional to 512.40, 707.13 and 302.49

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Solution

The fourth proportional to 512.40, 707.13 and 302.49 is: 417.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.40 : 707.13 = 302.49 : x
  2. Step 2: Convert to fraction form
    512.40/707.13 = 302.49/x
  3. Step 3: Cross multiply
    512.40x = 707.13 × 302.49
  4. Step 4: Simplify right side
    512.40x = 213,899.75
  5. Step 5: Solve for x
    x = 213,899.75/512.40
  6. Step 6: Final answer
    x = 417.45

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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.