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Finding the Fourth Proportional to 420,972.80, 630,921.60 and 171,372.80

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Solution

The fourth proportional to 420,972.80, 630,921.60 and 171,372.80 is: 256,840.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,972.80 : 630,921.60 = 171,372.80 : x
  2. Step 2: Convert to fraction form
    420,972.80/630,921.60 = 171,372.80/x
  3. Step 3: Cross multiply
    420,972.80x = 630,921.60 × 171,372.80
  4. Step 4: Simplify right side
    420,972.80x = 108,122,801,172.48
  5. Step 5: Solve for x
    x = 108,122,801,172.48/420,972.80
  6. Step 6: Final answer
    x = 256,840.35

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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.