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Finding the Fourth Proportional to 505.73, 695.91 and 490.70

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Solution

The fourth proportional to 505.73, 695.91 and 490.70 is: 675.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.73 : 695.91 = 490.70 : x
  2. Step 2: Convert to fraction form
    505.73/695.91 = 490.70/x
  3. Step 3: Cross multiply
    505.73x = 695.91 × 490.70
  4. Step 4: Simplify right side
    505.73x = 341,483.04
  5. Step 5: Solve for x
    x = 341,483.04/505.73
  6. Step 6: Final answer
    x = 675.23

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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.