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Finding the Fourth Proportional to 813.84, 1,219.14 and 658.98

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Solution

The fourth proportional to 813.84, 1,219.14 and 658.98 is: 987.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.84 : 1,219.14 = 658.98 : x
  2. Step 2: Convert to fraction form
    813.84/1,219.14 = 658.98/x
  3. Step 3: Cross multiply
    813.84x = 1,219.14 × 658.98
  4. Step 4: Simplify right side
    813.84x = 803,388.88
  5. Step 5: Solve for x
    x = 803,388.88/813.84
  6. Step 6: Final answer
    x = 987.16

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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.