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Finding the Fourth Proportional to 775.72, 1,070.76 and 481.24

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Solution

The fourth proportional to 775.72, 1,070.76 and 481.24 is: 664.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.72 : 1,070.76 = 481.24 : x
  2. Step 2: Convert to fraction form
    775.72/1,070.76 = 481.24/x
  3. Step 3: Cross multiply
    775.72x = 1,070.76 × 481.24
  4. Step 4: Simplify right side
    775.72x = 515,292.54
  5. Step 5: Solve for x
    x = 515,292.54/775.72
  6. Step 6: Final answer
    x = 664.28

Related Problems

Find fourth proportional to 387.86, 535.38 and 240.62
Half scale
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Double scale
Find fourth proportional to 776.72, 1,072.14 and 482.24
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.