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Finding the Fourth Proportional to 503.80, 695.21 and 282.78

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Solution

The fourth proportional to 503.80, 695.21 and 282.78 is: 390.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.80 : 695.21 = 282.78 : x
  2. Step 2: Convert to fraction form
    503.80/695.21 = 282.78/x
  3. Step 3: Cross multiply
    503.80x = 695.21 × 282.78
  4. Step 4: Simplify right side
    503.80x = 196,592.16
  5. Step 5: Solve for x
    x = 196,592.16/503.80
  6. Step 6: Final answer
    x = 390.22

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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.