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Finding the Fourth Proportional to 90,313.32, 135,420.60 and 71,712.84

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Solution

The fourth proportional to 90,313.32, 135,420.60 and 71,712.84 is: 107,530.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,313.32 : 135,420.60 = 71,712.84 : x
  2. Step 2: Convert to fraction form
    90,313.32/135,420.60 = 71,712.84/x
  3. Step 3: Cross multiply
    90,313.32x = 135,420.60 × 71,712.84
  4. Step 4: Simplify right side
    90,313.32x = 9,711,395,820.50
  5. Step 5: Solve for x
    x = 9,711,395,820.50/90,313.32
  6. Step 6: Final answer
    x = 107,530.05

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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.