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Finding the Fourth Proportional to 716,643.33, 988,955.27 and 389,945.31

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Solution

The fourth proportional to 716,643.33, 988,955.27 and 389,945.31 is: 538,117.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,643.33 : 988,955.27 = 389,945.31 : x
  2. Step 2: Convert to fraction form
    716,643.33/988,955.27 = 389,945.31/x
  3. Step 3: Cross multiply
    716,643.33x = 988,955.27 × 389,945.31
  4. Step 4: Simplify right side
    716,643.33x = 385,638,469,336.28
  5. Step 5: Solve for x
    x = 385,638,469,336.28/716,643.33
  6. Step 6: Final answer
    x = 538,117.71

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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.