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Finding the Fourth Proportional to 718.98, 992.18 and 404.25

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Solution

The fourth proportional to 718.98, 992.18 and 404.25 is: 557.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.98 : 992.18 = 404.25 : x
  2. Step 2: Convert to fraction form
    718.98/992.18 = 404.25/x
  3. Step 3: Cross multiply
    718.98x = 992.18 × 404.25
  4. Step 4: Simplify right side
    718.98x = 401,088.77
  5. Step 5: Solve for x
    x = 401,088.77/718.98
  6. Step 6: Final answer
    x = 557.86

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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.