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Finding the Fourth Proportional to 223,485.09, 308,420.51 and 138,629.49

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Solution

The fourth proportional to 223,485.09, 308,420.51 and 138,629.49 is: 191,315.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,485.09 : 308,420.51 = 138,629.49 : x
  2. Step 2: Convert to fraction form
    223,485.09/308,420.51 = 138,629.49/x
  3. Step 3: Cross multiply
    223,485.09x = 308,420.51 × 138,629.49
  4. Step 4: Simplify right side
    223,485.09x = 42,756,177,313.69
  5. Step 5: Solve for x
    x = 42,756,177,313.69/223,485.09
  6. Step 6: Final answer
    x = 191,315.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.