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Finding the Fourth Proportional to 256,601.70, 384,902.55 and 172,620.90

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Solution

The fourth proportional to 256,601.70, 384,902.55 and 172,620.90 is: 258,931.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,601.70 : 384,902.55 = 172,620.90 : x
  2. Step 2: Convert to fraction form
    256,601.70/384,902.55 = 172,620.90/x
  3. Step 3: Cross multiply
    256,601.70x = 384,902.55 × 172,620.90
  4. Step 4: Simplify right side
    256,601.70x = 66,442,224,593.30
  5. Step 5: Solve for x
    x = 66,442,224,593.30/256,601.70
  6. Step 6: Final answer
    x = 258,931.35

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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.