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Finding the Fourth Proportional to 552.50, 761.40 and 355.70

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Solution

The fourth proportional to 552.50, 761.40 and 355.70 is: 490.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.50 : 761.40 = 355.70 : x
  2. Step 2: Convert to fraction form
    552.50/761.40 = 355.70/x
  3. Step 3: Cross multiply
    552.50x = 761.40 × 355.70
  4. Step 4: Simplify right side
    552.50x = 270,829.98
  5. Step 5: Solve for x
    x = 270,829.98/552.50
  6. Step 6: Final answer
    x = 490.19

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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.