Home / 669,415.36-1,004,123.40-420,272.32

Finding the Fourth Proportional to 669,415.36, 1,004,123.40 and 420,272.32

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Solution

The fourth proportional to 669,415.36, 1,004,123.40 and 420,272.32 is: 630,408.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    669,415.36 : 1,004,123.40 = 420,272.32 : x
  2. Step 2: Convert to fraction form
    669,415.36/1,004,123.40 = 420,272.32/x
  3. Step 3: Cross multiply
    669,415.36x = 1,004,123.40 × 420,272.32
  4. Step 4: Simplify right side
    669,415.36x = 422,005,270,884.29
  5. Step 5: Solve for x
    x = 422,005,270,884.29/669,415.36
  6. Step 6: Final answer
    x = 630,408.71

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Double scale
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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.