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Finding the Fourth Proportional to 90,002.40, 135,003.60 and 81,837.60

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Solution

The fourth proportional to 90,002.40, 135,003.60 and 81,837.60 is: 122,756.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,002.40 : 135,003.60 = 81,837.60 : x
  2. Step 2: Convert to fraction form
    90,002.40/135,003.60 = 81,837.60/x
  3. Step 3: Cross multiply
    90,002.40x = 135,003.60 × 81,837.60
  4. Step 4: Simplify right side
    90,002.40x = 11,048,370,615.36
  5. Step 5: Solve for x
    x = 11,048,370,615.36/90,002.40
  6. Step 6: Final answer
    x = 122,756.40

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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.