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Finding the Fourth Proportional to 317.10, 437.22 and 280.20

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Solution

The fourth proportional to 317.10, 437.22 and 280.20 is: 386.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.10 : 437.22 = 280.20 : x
  2. Step 2: Convert to fraction form
    317.10/437.22 = 280.20/x
  3. Step 3: Cross multiply
    317.10x = 437.22 × 280.20
  4. Step 4: Simplify right side
    317.10x = 122,509.04
  5. Step 5: Solve for x
    x = 122,509.04/317.10
  6. Step 6: Final answer
    x = 386.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.