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Finding the Fourth Proportional to 90,774.40, 135,967.20 and 73,278.40

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Solution

The fourth proportional to 90,774.40, 135,967.20 and 73,278.40 is: 109,760.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,774.40 : 135,967.20 = 73,278.40 : x
  2. Step 2: Convert to fraction form
    90,774.40/135,967.20 = 73,278.40/x
  3. Step 3: Cross multiply
    90,774.40x = 135,967.20 × 73,278.40
  4. Step 4: Simplify right side
    90,774.40x = 9,963,458,868.48
  5. Step 5: Solve for x
    x = 9,963,458,868.48/90,774.40
  6. Step 6: Final answer
    x = 109,760.67

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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.