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Finding the Fourth Proportional to 420,131.80, 630,197.70 and 346,320.55

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Solution

The fourth proportional to 420,131.80, 630,197.70 and 346,320.55 is: 519,480.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,131.80 : 630,197.70 = 346,320.55 : x
  2. Step 2: Convert to fraction form
    420,131.80/630,197.70 = 346,320.55/x
  3. Step 3: Cross multiply
    420,131.80x = 630,197.70 × 346,320.55
  4. Step 4: Simplify right side
    420,131.80x = 218,250,414,072.74
  5. Step 5: Solve for x
    x = 218,250,414,072.74/420,131.80
  6. Step 6: Final answer
    x = 519,480.83

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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.