Home / 420,731.91-630,630.41-320,561.87

Finding the Fourth Proportional to 420,731.91, 630,630.41 and 320,561.87

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Solution

The fourth proportional to 420,731.91, 630,630.41 and 320,561.87 is: 480,486.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,731.91 : 630,630.41 = 320,561.87 : x
  2. Step 2: Convert to fraction form
    420,731.91/630,630.41 = 320,561.87/x
  3. Step 3: Cross multiply
    420,731.91x = 630,630.41 × 320,561.87
  4. Step 4: Simplify right side
    420,731.91x = 202,156,058,752.51
  5. Step 5: Solve for x
    x = 202,156,058,752.51/420,731.91
  6. Step 6: Final answer
    x = 480,486.63

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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.