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Finding the Fourth Proportional to 813.32, 1,218.45 and 401.98

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Solution

The fourth proportional to 813.32, 1,218.45 and 401.98 is: 602.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.32 : 1,218.45 = 401.98 : x
  2. Step 2: Convert to fraction form
    813.32/1,218.45 = 401.98/x
  3. Step 3: Cross multiply
    813.32x = 1,218.45 × 401.98
  4. Step 4: Simplify right side
    813.32x = 489,792.53
  5. Step 5: Solve for x
    x = 489,792.53/813.32
  6. Step 6: Final answer
    x = 602.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.