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Finding the Fourth Proportional to 742.69, 1,025.36 and 481.20

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Solution

The fourth proportional to 742.69, 1,025.36 and 481.20 is: 664.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.69 : 1,025.36 = 481.20 : x
  2. Step 2: Convert to fraction form
    742.69/1,025.36 = 481.20/x
  3. Step 3: Cross multiply
    742.69x = 1,025.36 × 481.20
  4. Step 4: Simplify right side
    742.69x = 493,403.23
  5. Step 5: Solve for x
    x = 493,403.23/742.69
  6. Step 6: Final answer
    x = 664.35

Related Problems

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Half scale
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Double scale
Find fourth proportional to 743.69, 1,026.74 and 482.20
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.