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Finding the Fourth Proportional to 486.03, 670.50 and 311.25

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Solution

The fourth proportional to 486.03, 670.50 and 311.25 is: 429.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.03 : 670.50 = 311.25 : x
  2. Step 2: Convert to fraction form
    486.03/670.50 = 311.25/x
  3. Step 3: Cross multiply
    486.03x = 670.50 × 311.25
  4. Step 4: Simplify right side
    486.03x = 208,693.13
  5. Step 5: Solve for x
    x = 208,693.13/486.03
  6. Step 6: Final answer
    x = 429.38

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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.