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Finding the Fourth Proportional to 256,741.20, 385,111.80 and 172,760.40

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Solution

The fourth proportional to 256,741.20, 385,111.80 and 172,760.40 is: 259,140.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,741.20 : 385,111.80 = 172,760.40 : x
  2. Step 2: Convert to fraction form
    256,741.20/385,111.80 = 172,760.40/x
  3. Step 3: Cross multiply
    256,741.20x = 385,111.80 × 172,760.40
  4. Step 4: Simplify right side
    256,741.20x = 66,532,068,612.72
  5. Step 5: Solve for x
    x = 66,532,068,612.72/256,741.20
  6. Step 6: Final answer
    x = 259,140.60

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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.