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Finding the Fourth Proportional to 370.21, 555.15 and 126.57

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Solution

The fourth proportional to 370.21, 555.15 and 126.57 is: 189.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.21 : 555.15 = 126.57 : x
  2. Step 2: Convert to fraction form
    370.21/555.15 = 126.57/x
  3. Step 3: Cross multiply
    370.21x = 555.15 × 126.57
  4. Step 4: Simplify right side
    370.21x = 70,265.34
  5. Step 5: Solve for x
    x = 70,265.34/370.21
  6. Step 6: Final answer
    x = 189.80

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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.