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Finding the Fourth Proportional to 857.44, 1,286.57 and 424.63

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Solution

The fourth proportional to 857.44, 1,286.57 and 424.63 is: 637.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.44 : 1,286.57 = 424.63 : x
  2. Step 2: Convert to fraction form
    857.44/1,286.57 = 424.63/x
  3. Step 3: Cross multiply
    857.44x = 1,286.57 × 424.63
  4. Step 4: Simplify right side
    857.44x = 546,316.22
  5. Step 5: Solve for x
    x = 546,316.22/857.44
  6. Step 6: Final answer
    x = 637.15

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Double scale
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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.