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Finding the Fourth Proportional to 370.86, 555.91 and 127.20

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Solution

The fourth proportional to 370.86, 555.91 and 127.20 is: 190.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.86 : 555.91 = 127.20 : x
  2. Step 2: Convert to fraction form
    370.86/555.91 = 127.20/x
  3. Step 3: Cross multiply
    370.86x = 555.91 × 127.20
  4. Step 4: Simplify right side
    370.86x = 70,711.75
  5. Step 5: Solve for x
    x = 70,711.75/370.86
  6. Step 6: Final answer
    x = 190.67

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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.