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Finding the Fourth Proportional to 608.69, 840.69 and 411.86

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Solution

The fourth proportional to 608.69, 840.69 and 411.86 is: 568.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.69 : 840.69 = 411.86 : x
  2. Step 2: Convert to fraction form
    608.69/840.69 = 411.86/x
  3. Step 3: Cross multiply
    608.69x = 840.69 × 411.86
  4. Step 4: Simplify right side
    608.69x = 346,248.69
  5. Step 5: Solve for x
    x = 346,248.69/608.69
  6. Step 6: Final answer
    x = 568.84

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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.