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Finding the Fourth Proportional to 389,920.79, 538,090.73 and 211,072.79

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Solution

The fourth proportional to 389,920.79, 538,090.73 and 211,072.79 is: 291,280.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,920.79 : 538,090.73 = 211,072.79 : x
  2. Step 2: Convert to fraction form
    389,920.79/538,090.73 = 211,072.79/x
  3. Step 3: Cross multiply
    389,920.79x = 538,090.73 × 211,072.79
  4. Step 4: Simplify right side
    389,920.79x = 113,576,307,908.42
  5. Step 5: Solve for x
    x = 113,576,307,908.42/389,920.79
  6. Step 6: Final answer
    x = 291,280.47

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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.