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Finding the Fourth Proportional to 479.21, 718.65 and 154.50

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Solution

The fourth proportional to 479.21, 718.65 and 154.50 is: 231.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.21 : 718.65 = 154.50 : x
  2. Step 2: Convert to fraction form
    479.21/718.65 = 154.50/x
  3. Step 3: Cross multiply
    479.21x = 718.65 × 154.50
  4. Step 4: Simplify right side
    479.21x = 111,031.43
  5. Step 5: Solve for x
    x = 111,031.43/479.21
  6. Step 6: Final answer
    x = 231.70

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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.