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Finding the Fourth Proportional to 259,985.80, 389,978.70 and 126,951.40

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Solution

The fourth proportional to 259,985.80, 389,978.70 and 126,951.40 is: 190,427.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,985.80 : 389,978.70 = 126,951.40 : x
  2. Step 2: Convert to fraction form
    259,985.80/389,978.70 = 126,951.40/x
  3. Step 3: Cross multiply
    259,985.80x = 389,978.70 × 126,951.40
  4. Step 4: Simplify right side
    259,985.80x = 49,508,341,935.18
  5. Step 5: Solve for x
    x = 49,508,341,935.18/259,985.80
  6. Step 6: Final answer
    x = 190,427.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.