Home / 389,919.40-538,083.78-211,071.40

Finding the Fourth Proportional to 389,919.40, 538,083.78 and 211,071.40

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Solution

The fourth proportional to 389,919.40, 538,083.78 and 211,071.40 is: 291,275.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,919.40 : 538,083.78 = 211,071.40 : x
  2. Step 2: Convert to fraction form
    389,919.40/538,083.78 = 211,071.40/x
  3. Step 3: Cross multiply
    389,919.40x = 538,083.78 × 211,071.40
  4. Step 4: Simplify right side
    389,919.40x = 113,574,096,761.89
  5. Step 5: Solve for x
    x = 113,574,096,761.89/389,919.40
  6. Step 6: Final answer
    x = 291,275.83

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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.