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Finding the Fourth Proportional to 431.68, 647.20 and 175.20

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Solution

The fourth proportional to 431.68, 647.20 and 175.20 is: 262.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.68 : 647.20 = 175.20 : x
  2. Step 2: Convert to fraction form
    431.68/647.20 = 175.20/x
  3. Step 3: Cross multiply
    431.68x = 647.20 × 175.20
  4. Step 4: Simplify right side
    431.68x = 113,389.44
  5. Step 5: Solve for x
    x = 113,389.44/431.68
  6. Step 6: Final answer
    x = 262.67

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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.