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Finding the Fourth Proportional to 838.37, 1,256.71 and 290.18

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Solution

The fourth proportional to 838.37, 1,256.71 and 290.18 is: 434.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.37 : 1,256.71 = 290.18 : x
  2. Step 2: Convert to fraction form
    838.37/1,256.71 = 290.18/x
  3. Step 3: Cross multiply
    838.37x = 1,256.71 × 290.18
  4. Step 4: Simplify right side
    838.37x = 364,672.11
  5. Step 5: Solve for x
    x = 364,672.11/838.37
  6. Step 6: Final answer
    x = 434.98

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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.