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Finding the Fourth Proportional to 838.08, 1,256.28 and 317.64

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Solution

The fourth proportional to 838.08, 1,256.28 and 317.64 is: 476.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.08 : 1,256.28 = 317.64 : x
  2. Step 2: Convert to fraction form
    838.08/1,256.28 = 317.64/x
  3. Step 3: Cross multiply
    838.08x = 1,256.28 × 317.64
  4. Step 4: Simplify right side
    838.08x = 399,044.78
  5. Step 5: Solve for x
    x = 399,044.78/838.08
  6. Step 6: Final answer
    x = 476.14

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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.