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Finding the Fourth Proportional to 70,415.20, 105,622.80 and 65,749.60

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Solution

The fourth proportional to 70,415.20, 105,622.80 and 65,749.60 is: 98,624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,415.20 : 105,622.80 = 65,749.60 : x
  2. Step 2: Convert to fraction form
    70,415.20/105,622.80 = 65,749.60/x
  3. Step 3: Cross multiply
    70,415.20x = 105,622.80 × 65,749.60
  4. Step 4: Simplify right side
    70,415.20x = 6,944,656,850.88
  5. Step 5: Solve for x
    x = 6,944,656,850.88/70,415.20
  6. Step 6: Final answer
    x = 98,624.40

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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.