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Finding the Fourth Proportional to 256,000.80, 384,001.20 and 78,506.40

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Solution

The fourth proportional to 256,000.80, 384,001.20 and 78,506.40 is: 117,759.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,000.80 : 384,001.20 = 78,506.40 : x
  2. Step 2: Convert to fraction form
    256,000.80/384,001.20 = 78,506.40/x
  3. Step 3: Cross multiply
    256,000.80x = 384,001.20 × 78,506.40
  4. Step 4: Simplify right side
    256,000.80x = 30,146,551,807.68
  5. Step 5: Solve for x
    x = 30,146,551,807.68/256,000.80
  6. Step 6: Final answer
    x = 117,759.60

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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.