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Finding the Fourth Proportional to 842.55, 1,263.99 and 257.63

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Solution

The fourth proportional to 842.55, 1,263.99 and 257.63 is: 386.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.55 : 1,263.99 = 257.63 : x
  2. Step 2: Convert to fraction form
    842.55/1,263.99 = 257.63/x
  3. Step 3: Cross multiply
    842.55x = 1,263.99 × 257.63
  4. Step 4: Simplify right side
    842.55x = 325,637.30
  5. Step 5: Solve for x
    x = 325,637.30/842.55
  6. Step 6: Final answer
    x = 386.49

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Double scale
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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.