Home / 420,387.38-630,830.28-393,789.20

Finding the Fourth Proportional to 420,387.38, 630,830.28 and 393,789.20

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Solution

The fourth proportional to 420,387.38, 630,830.28 and 393,789.20 is: 590,917.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,387.38 : 630,830.28 = 393,789.20 : x
  2. Step 2: Convert to fraction form
    420,387.38/630,830.28 = 393,789.20/x
  3. Step 3: Cross multiply
    420,387.38x = 630,830.28 × 393,789.20
  4. Step 4: Simplify right side
    420,387.38x = 248,414,151,296.98
  5. Step 5: Solve for x
    x = 248,414,151,296.98/420,387.38
  6. Step 6: Final answer
    x = 590,917.24

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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.