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Finding the Fourth Proportional to 666.96, 996 and 521.04

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Solution

The fourth proportional to 666.96, 996 and 521.04 is: 778.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.96 : 996 = 521.04 : x
  2. Step 2: Convert to fraction form
    666.96/996 = 521.04/x
  3. Step 3: Cross multiply
    666.96x = 996 × 521.04
  4. Step 4: Simplify right side
    666.96x = 518,955.84
  5. Step 5: Solve for x
    x = 518,955.84/666.96
  6. Step 6: Final answer
    x = 778.09

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.