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Finding the Fourth Proportional to 504.28, 756.42 and 139.06

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Solution

The fourth proportional to 504.28, 756.42 and 139.06 is: 208.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.28 : 756.42 = 139.06 : x
  2. Step 2: Convert to fraction form
    504.28/756.42 = 139.06/x
  3. Step 3: Cross multiply
    504.28x = 756.42 × 139.06
  4. Step 4: Simplify right side
    504.28x = 105,185.87
  5. Step 5: Solve for x
    x = 105,185.87/504.28
  6. Step 6: Final answer
    x = 208.59

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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.