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Finding the Fourth Proportional to 504.20, 756.29 and 138.98

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Solution

The fourth proportional to 504.20, 756.29 and 138.98 is: 208.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.20 : 756.29 = 138.98 : x
  2. Step 2: Convert to fraction form
    504.20/756.29 = 138.98/x
  3. Step 3: Cross multiply
    504.20x = 756.29 × 138.98
  4. Step 4: Simplify right side
    504.20x = 105,104.71
  5. Step 5: Solve for x
    x = 105,104.71/504.20
  6. Step 6: Final answer
    x = 208.46

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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.