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Finding the Fourth Proportional to 486.64, 671.60 and 312.36

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Solution

The fourth proportional to 486.64, 671.60 and 312.36 is: 431.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.64 : 671.60 = 312.36 : x
  2. Step 2: Convert to fraction form
    486.64/671.60 = 312.36/x
  3. Step 3: Cross multiply
    486.64x = 671.60 × 312.36
  4. Step 4: Simplify right side
    486.64x = 209,780.98
  5. Step 5: Solve for x
    x = 209,780.98/486.64
  6. Step 6: Final answer
    x = 431.08

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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.