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Finding the Fourth Proportional to 256,937.20, 385,405.80 and 90,703.60

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Solution

The fourth proportional to 256,937.20, 385,405.80 and 90,703.60 is: 136,055.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,937.20 : 385,405.80 = 90,703.60 : x
  2. Step 2: Convert to fraction form
    256,937.20/385,405.80 = 90,703.60/x
  3. Step 3: Cross multiply
    256,937.20x = 385,405.80 × 90,703.60
  4. Step 4: Simplify right side
    256,937.20x = 34,957,693,520.88
  5. Step 5: Solve for x
    x = 34,957,693,520.88/256,937.20
  6. Step 6: Final answer
    x = 136,055.40

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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.