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Finding the Fourth Proportional to 103,311.60, 154,967.40 and 90,189.60

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Solution

The fourth proportional to 103,311.60, 154,967.40 and 90,189.60 is: 135,284.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,311.60 : 154,967.40 = 90,189.60 : x
  2. Step 2: Convert to fraction form
    103,311.60/154,967.40 = 90,189.60/x
  3. Step 3: Cross multiply
    103,311.60x = 154,967.40 × 90,189.60
  4. Step 4: Simplify right side
    103,311.60x = 13,976,447,819.04
  5. Step 5: Solve for x
    x = 13,976,447,819.04/103,311.60
  6. Step 6: Final answer
    x = 135,284.40

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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.