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Finding the Fourth Proportional to 638.06, 878.98 and 497.93

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Solution

The fourth proportional to 638.06, 878.98 and 497.93 is: 685.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.06 : 878.98 = 497.93 : x
  2. Step 2: Convert to fraction form
    638.06/878.98 = 497.93/x
  3. Step 3: Cross multiply
    638.06x = 878.98 × 497.93
  4. Step 4: Simplify right side
    638.06x = 437,670.51
  5. Step 5: Solve for x
    x = 437,670.51/638.06
  6. Step 6: Final answer
    x = 685.94

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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.