Home / 3,120.58-4,680.87-929.31

Finding the Fourth Proportional to 3,120.58, 4,680.87 and 929.31

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Solution

The fourth proportional to 3,120.58, 4,680.87 and 929.31 is: 1,393.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.58 : 4,680.87 = 929.31 : x
  2. Step 2: Convert to fraction form
    3,120.58/4,680.87 = 929.31/x
  3. Step 3: Cross multiply
    3,120.58x = 4,680.87 × 929.31
  4. Step 4: Simplify right side
    3,120.58x = 4,349,979.30
  5. Step 5: Solve for x
    x = 4,349,979.30/3,120.58
  6. Step 6: Final answer
    x = 1,393.97

Related Problems

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Half scale
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Double scale
Find fourth proportional to 3,121.58, 4,682.37 and 930.31
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.