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Finding the Fourth Proportional to 256,839.40, 385,260.30 and 90,627.40

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Solution

The fourth proportional to 256,839.40, 385,260.30 and 90,627.40 is: 135,941.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,839.40 : 385,260.30 = 90,627.40 : x
  2. Step 2: Convert to fraction form
    256,839.40/385,260.30 = 90,627.40/x
  3. Step 3: Cross multiply
    256,839.40x = 385,260.30 × 90,627.40
  4. Step 4: Simplify right side
    256,839.40x = 34,915,139,312.22
  5. Step 5: Solve for x
    x = 34,915,139,312.22/256,839.40
  6. Step 6: Final answer
    x = 135,941.52

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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.