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Finding the Fourth Proportional to 486.63, 671.78 and 312.08

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Solution

The fourth proportional to 486.63, 671.78 and 312.08 is: 430.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.63 : 671.78 = 312.08 : x
  2. Step 2: Convert to fraction form
    486.63/671.78 = 312.08/x
  3. Step 3: Cross multiply
    486.63x = 671.78 × 312.08
  4. Step 4: Simplify right side
    486.63x = 209,646.52
  5. Step 5: Solve for x
    x = 209,646.52/486.63
  6. Step 6: Final answer
    x = 430.81

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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.