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Finding the Fourth Proportional to 370.79, 556.16 and 139.64

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Solution

The fourth proportional to 370.79, 556.16 and 139.64 is: 209.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.79 : 556.16 = 139.64 : x
  2. Step 2: Convert to fraction form
    370.79/556.16 = 139.64/x
  3. Step 3: Cross multiply
    370.79x = 556.16 × 139.64
  4. Step 4: Simplify right side
    370.79x = 77,659.75
  5. Step 5: Solve for x
    x = 77,659.75/370.79
  6. Step 6: Final answer
    x = 209.45

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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.