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Finding the Fourth Proportional to 691,749, 954,628.20 and 389,943

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Solution

The fourth proportional to 691,749, 954,628.20 and 389,943 is: 538,129.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,749 : 954,628.20 = 389,943 : x
  2. Step 2: Convert to fraction form
    691,749/954,628.20 = 389,943/x
  3. Step 3: Cross multiply
    691,749x = 954,628.20 × 389,943
  4. Step 4: Simplify right side
    691,749x = 372,250,584,192.60
  5. Step 5: Solve for x
    x = 372,250,584,192.60/691,749
  6. Step 6: Final answer
    x = 538,129.56

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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.