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Finding the Fourth Proportional to 853.10, 1,176.98 and 479.99

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Solution

The fourth proportional to 853.10, 1,176.98 and 479.99 is: 662.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.10 : 1,176.98 = 479.99 : x
  2. Step 2: Convert to fraction form
    853.10/1,176.98 = 479.99/x
  3. Step 3: Cross multiply
    853.10x = 1,176.98 × 479.99
  4. Step 4: Simplify right side
    853.10x = 564,930.35
  5. Step 5: Solve for x
    x = 564,930.35/853.10
  6. Step 6: Final answer
    x = 662.21

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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.