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Finding the Fourth Proportional to 485.13, 724.29 and 426.35

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Solution

The fourth proportional to 485.13, 724.29 and 426.35 is: 636.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.13 : 724.29 = 426.35 : x
  2. Step 2: Convert to fraction form
    485.13/724.29 = 426.35/x
  3. Step 3: Cross multiply
    485.13x = 724.29 × 426.35
  4. Step 4: Simplify right side
    485.13x = 308,802.63
  5. Step 5: Solve for x
    x = 308,802.63/485.13
  6. Step 6: Final answer
    x = 636.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.