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Finding the Fourth Proportional to 485.71, 669.99 and 453.31

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Solution

The fourth proportional to 485.71, 669.99 and 453.31 is: 625.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.71 : 669.99 = 453.31 : x
  2. Step 2: Convert to fraction form
    485.71/669.99 = 453.31/x
  3. Step 3: Cross multiply
    485.71x = 669.99 × 453.31
  4. Step 4: Simplify right side
    485.71x = 303,713.17
  5. Step 5: Solve for x
    x = 303,713.17/485.71
  6. Step 6: Final answer
    x = 625.30

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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.