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Finding the Fourth Proportional to 838.26, 1,257.57 and 427.62

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Solution

The fourth proportional to 838.26, 1,257.57 and 427.62 is: 641.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.26 : 1,257.57 = 427.62 : x
  2. Step 2: Convert to fraction form
    838.26/1,257.57 = 427.62/x
  3. Step 3: Cross multiply
    838.26x = 1,257.57 × 427.62
  4. Step 4: Simplify right side
    838.26x = 537,762.08
  5. Step 5: Solve for x
    x = 537,762.08/838.26
  6. Step 6: Final answer
    x = 641.52

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.