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Finding the Fourth Proportional to 486.24, 670.24 and 311.28

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Solution

The fourth proportional to 486.24, 670.24 and 311.28 is: 429.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.24 : 670.24 = 311.28 : x
  2. Step 2: Convert to fraction form
    486.24/670.24 = 311.28/x
  3. Step 3: Cross multiply
    486.24x = 670.24 × 311.28
  4. Step 4: Simplify right side
    486.24x = 208,632.31
  5. Step 5: Solve for x
    x = 208,632.31/486.24
  6. Step 6: Final answer
    x = 429.07

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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.