Home / 280,917.89-421,418.78-103,411.40

Finding the Fourth Proportional to 280,917.89, 421,418.78 and 103,411.40

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Solution

The fourth proportional to 280,917.89, 421,418.78 and 103,411.40 is: 155,132.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,917.89 : 421,418.78 = 103,411.40 : x
  2. Step 2: Convert to fraction form
    280,917.89/421,418.78 = 103,411.40/x
  3. Step 3: Cross multiply
    280,917.89x = 421,418.78 × 103,411.40
  4. Step 4: Simplify right side
    280,917.89x = 43,579,506,741.90
  5. Step 5: Solve for x
    x = 43,579,506,741.90/280,917.89
  6. Step 6: Final answer
    x = 155,132.54

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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.