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Finding the Fourth Proportional to 70,515.40, 105,945.90 and 53,019.40

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Solution

The fourth proportional to 70,515.40, 105,945.90 and 53,019.40 is: 79,659.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,515.40 : 105,945.90 = 53,019.40 : x
  2. Step 2: Convert to fraction form
    70,515.40/105,945.90 = 53,019.40/x
  3. Step 3: Cross multiply
    70,515.40x = 105,945.90 × 53,019.40
  4. Step 4: Simplify right side
    70,515.40x = 5,617,188,050.46
  5. Step 5: Solve for x
    x = 5,617,188,050.46/70,515.40
  6. Step 6: Final answer
    x = 79,659.03

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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.