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Finding the Fourth Proportional to 317.36, 474.96 and 290.72

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Solution

The fourth proportional to 317.36, 474.96 and 290.72 is: 435.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.36 : 474.96 = 290.72 : x
  2. Step 2: Convert to fraction form
    317.36/474.96 = 290.72/x
  3. Step 3: Cross multiply
    317.36x = 474.96 × 290.72
  4. Step 4: Simplify right side
    317.36x = 138,080.37
  5. Step 5: Solve for x
    x = 138,080.37/317.36
  6. Step 6: Final answer
    x = 435.09

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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.