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Finding the Fourth Proportional to 420,115.40, 630,633.90 and 262,521.80

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Solution

The fourth proportional to 420,115.40, 630,633.90 and 262,521.80 is: 394,070.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,115.40 : 630,633.90 = 262,521.80 : x
  2. Step 2: Convert to fraction form
    420,115.40/630,633.90 = 262,521.80/x
  3. Step 3: Cross multiply
    420,115.40x = 630,633.90 × 262,521.80
  4. Step 4: Simplify right side
    420,115.40x = 165,555,146,569.02
  5. Step 5: Solve for x
    x = 165,555,146,569.02/420,115.40
  6. Step 6: Final answer
    x = 394,070.64

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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.