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Finding the Fourth Proportional to 389,886.51, 538,013.35 and 220,137.39

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Solution

The fourth proportional to 389,886.51, 538,013.35 and 220,137.39 is: 303,772.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,886.51 : 538,013.35 = 220,137.39 : x
  2. Step 2: Convert to fraction form
    389,886.51/538,013.35 = 220,137.39/x
  3. Step 3: Cross multiply
    389,886.51x = 538,013.35 × 220,137.39
  4. Step 4: Simplify right side
    389,886.51x = 118,436,854,654.16
  5. Step 5: Solve for x
    x = 118,436,854,654.16/389,886.51
  6. Step 6: Final answer
    x = 303,772.64

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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.