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Finding the Fourth Proportional to 256,901.40, 385,352.10 and 172,920.60

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Solution

The fourth proportional to 256,901.40, 385,352.10 and 172,920.60 is: 259,380.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,901.40 : 385,352.10 = 172,920.60 : x
  2. Step 2: Convert to fraction form
    256,901.40/385,352.10 = 172,920.60/x
  3. Step 3: Cross multiply
    256,901.40x = 385,352.10 × 172,920.60
  4. Step 4: Simplify right side
    256,901.40x = 66,635,316,343.26
  5. Step 5: Solve for x
    x = 66,635,316,343.26/256,901.40
  6. Step 6: Final answer
    x = 259,380.90

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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.