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Finding the Fourth Proportional to 380,285.88, 570,505 and 140,401.28

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Solution

The fourth proportional to 380,285.88, 570,505 and 140,401.28 is: 210,630.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    380,285.88 : 570,505 = 140,401.28 : x
  2. Step 2: Convert to fraction form
    380,285.88/570,505 = 140,401.28/x
  3. Step 3: Cross multiply
    380,285.88x = 570,505 × 140,401.28
  4. Step 4: Simplify right side
    380,285.88x = 80,099,632,246.40
  5. Step 5: Solve for x
    x = 80,099,632,246.40/380,285.88
  6. Step 6: Final answer
    x = 210,630.05

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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.