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Finding the Fourth Proportional to 681,099.47, 939,881.40 and 390,696.38

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Solution

The fourth proportional to 681,099.47, 939,881.40 and 390,696.38 is: 539,140.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,099.47 : 939,881.40 = 390,696.38 : x
  2. Step 2: Convert to fraction form
    681,099.47/939,881.40 = 390,696.38/x
  3. Step 3: Cross multiply
    681,099.47x = 939,881.40 × 390,696.38
  4. Step 4: Simplify right side
    681,099.47x = 367,208,260,609.33
  5. Step 5: Solve for x
    x = 367,208,260,609.33/681,099.47
  6. Step 6: Final answer
    x = 539,140.43

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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.