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Finding the Fourth Proportional to 209,486.98, 289,041.62 and 123,449.48

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Solution

The fourth proportional to 209,486.98, 289,041.62 and 123,449.48 is: 170,330.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,486.98 : 289,041.62 = 123,449.48 : x
  2. Step 2: Convert to fraction form
    209,486.98/289,041.62 = 123,449.48/x
  3. Step 3: Cross multiply
    209,486.98x = 289,041.62 × 123,449.48
  4. Step 4: Simplify right side
    209,486.98x = 35,682,038,718.59
  5. Step 5: Solve for x
    x = 35,682,038,718.59/209,486.98
  6. Step 6: Final answer
    x = 170,330.58

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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.