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Finding the Fourth Proportional to 505.62, 696.87 and 491.58

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Solution

The fourth proportional to 505.62, 696.87 and 491.58 is: 677.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.62 : 696.87 = 491.58 : x
  2. Step 2: Convert to fraction form
    505.62/696.87 = 491.58/x
  3. Step 3: Cross multiply
    505.62x = 696.87 × 491.58
  4. Step 4: Simplify right side
    505.62x = 342,567.35
  5. Step 5: Solve for x
    x = 342,567.35/505.62
  6. Step 6: Final answer
    x = 677.52

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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.