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Finding the Fourth Proportional to 140,420.40, 210,630.60 and 87,276.30

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Solution

The fourth proportional to 140,420.40, 210,630.60 and 87,276.30 is: 130,914.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,420.40 : 210,630.60 = 87,276.30 : x
  2. Step 2: Convert to fraction form
    140,420.40/210,630.60 = 87,276.30/x
  3. Step 3: Cross multiply
    140,420.40x = 210,630.60 × 87,276.30
  4. Step 4: Simplify right side
    140,420.40x = 18,383,059,434.78
  5. Step 5: Solve for x
    x = 18,383,059,434.78/140,420.40
  6. Step 6: Final answer
    x = 130,914.45

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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.