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Finding the Fourth Proportional to 70,145,999.70, 105,218,999.55 and 53,139,887.70

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Solution

The fourth proportional to 70,145,999.70, 105,218,999.55 and 53,139,887.70 is: 79,709,831.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,145,999.70 : 105,218,999.55 = 53,139,887.70 : x
  2. Step 2: Convert to fraction form
    70,145,999.70/105,218,999.55 = 53,139,887.70/x
  3. Step 3: Cross multiply
    70,145,999.70x = 105,218,999.55 × 53,139,887.70
  4. Step 4: Simplify right side
    70,145,999.70x = 5,591,325,819,993,351
  5. Step 5: Solve for x
    x = 5,591,325,819,993,351/70,145,999.70
  6. Step 6: Final answer
    x = 79,709,831.55

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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.