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Finding the Fourth Proportional to 70,918.49, 106,378.07 and 20,999.53

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Solution

The fourth proportional to 70,918.49, 106,378.07 and 20,999.53 is: 31,499.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,918.49 : 106,378.07 = 20,999.53 : x
  2. Step 2: Convert to fraction form
    70,918.49/106,378.07 = 20,999.53/x
  3. Step 3: Cross multiply
    70,918.49x = 106,378.07 × 20,999.53
  4. Step 4: Simplify right side
    70,918.49x = 2,233,888,940.42
  5. Step 5: Solve for x
    x = 2,233,888,940.42/70,918.49
  6. Step 6: Final answer
    x = 31,499.39

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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.