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Finding the Fourth Proportional to 420,008.60, 630,012.90 and 230,395.70

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Solution

The fourth proportional to 420,008.60, 630,012.90 and 230,395.70 is: 345,593.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,008.60 : 630,012.90 = 230,395.70 : x
  2. Step 2: Convert to fraction form
    420,008.60/630,012.90 = 230,395.70/x
  3. Step 3: Cross multiply
    420,008.60x = 630,012.90 × 230,395.70
  4. Step 4: Simplify right side
    420,008.60x = 145,152,263,104.53
  5. Step 5: Solve for x
    x = 145,152,263,104.53/420,008.60
  6. Step 6: Final answer
    x = 345,593.55

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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.