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Finding the Fourth Proportional to 140,003.20, 210,004.80 and 90,139.60

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Solution

The fourth proportional to 140,003.20, 210,004.80 and 90,139.60 is: 135,209.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,003.20 : 210,004.80 = 90,139.60 : x
  2. Step 2: Convert to fraction form
    140,003.20/210,004.80 = 90,139.60/x
  3. Step 3: Cross multiply
    140,003.20x = 210,004.80 × 90,139.60
  4. Step 4: Simplify right side
    140,003.20x = 18,929,748,670.08
  5. Step 5: Solve for x
    x = 18,929,748,670.08/140,003.20
  6. Step 6: Final answer
    x = 135,209.40

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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.