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Finding the Fourth Proportional to 639.18, 958.77 and 365.13

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Solution

The fourth proportional to 639.18, 958.77 and 365.13 is: 547.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.18 : 958.77 = 365.13 : x
  2. Step 2: Convert to fraction form
    639.18/958.77 = 365.13/x
  3. Step 3: Cross multiply
    639.18x = 958.77 × 365.13
  4. Step 4: Simplify right side
    639.18x = 350,075.69
  5. Step 5: Solve for x
    x = 350,075.69/639.18
  6. Step 6: Final answer
    x = 547.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.