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Finding the Fourth Proportional to 256,939.90, 385,520.11 and 99,279.07

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Solution

The fourth proportional to 256,939.90, 385,520.11 and 99,279.07 is: 148,961.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,939.90 : 385,520.11 = 99,279.07 : x
  2. Step 2: Convert to fraction form
    256,939.90/385,520.11 = 99,279.07/x
  3. Step 3: Cross multiply
    256,939.90x = 385,520.11 × 99,279.07
  4. Step 4: Simplify right side
    256,939.90x = 38,274,076,775.10
  5. Step 5: Solve for x
    x = 38,274,076,775.10/256,939.90
  6. Step 6: Final answer
    x = 148,961.21

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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.