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Finding the Fourth Proportional to 512.72, 707.64 and 305.76

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Solution

The fourth proportional to 512.72, 707.64 and 305.76 is: 422.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.72 : 707.64 = 305.76 : x
  2. Step 2: Convert to fraction form
    512.72/707.64 = 305.76/x
  3. Step 3: Cross multiply
    512.72x = 707.64 × 305.76
  4. Step 4: Simplify right side
    512.72x = 216,368.01
  5. Step 5: Solve for x
    x = 216,368.01/512.72
  6. Step 6: Final answer
    x = 422.00

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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.