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Finding the Fourth Proportional to 838.49, 1,257.63 and 427.92

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Solution

The fourth proportional to 838.49, 1,257.63 and 427.92 is: 641.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.49 : 1,257.63 = 427.92 : x
  2. Step 2: Convert to fraction form
    838.49/1,257.63 = 427.92/x
  3. Step 3: Cross multiply
    838.49x = 1,257.63 × 427.92
  4. Step 4: Simplify right side
    838.49x = 538,158.71
  5. Step 5: Solve for x
    x = 538,158.71/838.49
  6. Step 6: Final answer
    x = 641.82

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1.5x scale

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.