Home / 280,965.40-421,448.10-81,292.30

Finding the Fourth Proportional to 280,965.40, 421,448.10 and 81,292.30

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Solution

The fourth proportional to 280,965.40, 421,448.10 and 81,292.30 is: 121,938.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,965.40 : 421,448.10 = 81,292.30 : x
  2. Step 2: Convert to fraction form
    280,965.40/421,448.10 = 81,292.30/x
  3. Step 3: Cross multiply
    280,965.40x = 421,448.10 × 81,292.30
  4. Step 4: Simplify right side
    280,965.40x = 34,260,485,379.63
  5. Step 5: Solve for x
    x = 34,260,485,379.63/280,965.40
  6. Step 6: Final answer
    x = 121,938.45

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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.