Home / 7,815.78-10,782.45-4,982.40

Finding the Fourth Proportional to 7,815.78, 10,782.45 and 4,982.40

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Solution

The fourth proportional to 7,815.78, 10,782.45 and 4,982.40 is: 6,873.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.78 : 10,782.45 = 4,982.40 : x
  2. Step 2: Convert to fraction form
    7,815.78/10,782.45 = 4,982.40/x
  3. Step 3: Cross multiply
    7,815.78x = 10,782.45 × 4,982.40
  4. Step 4: Simplify right side
    7,815.78x = 53,722,478.88
  5. Step 5: Solve for x
    x = 53,722,478.88/7,815.78
  6. Step 6: Final answer
    x = 6,873.59

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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.