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Finding the Fourth Proportional to 389,918.28, 538,087.28 and 211,070.28

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Solution

The fourth proportional to 389,918.28, 538,087.28 and 211,070.28 is: 291,277.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,918.28 : 538,087.28 = 211,070.28 : x
  2. Step 2: Convert to fraction form
    389,918.28/538,087.28 = 211,070.28/x
  3. Step 3: Cross multiply
    389,918.28x = 538,087.28 × 211,070.28
  4. Step 4: Simplify right side
    389,918.28x = 113,574,232,854.04
  5. Step 5: Solve for x
    x = 113,574,232,854.04/389,918.28
  6. Step 6: Final answer
    x = 291,277.02

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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.