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Finding the Fourth Proportional to 256,939.40, 385,409.10 and 163,512.20

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Solution

The fourth proportional to 256,939.40, 385,409.10 and 163,512.20 is: 245,268.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,939.40 : 385,409.10 = 163,512.20 : x
  2. Step 2: Convert to fraction form
    256,939.40/385,409.10 = 163,512.20/x
  3. Step 3: Cross multiply
    256,939.40x = 385,409.10 × 163,512.20
  4. Step 4: Simplify right side
    256,939.40x = 63,019,089,841.02
  5. Step 5: Solve for x
    x = 63,019,089,841.02/256,939.40
  6. Step 6: Final answer
    x = 245,268.30

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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.