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Finding the Fourth Proportional to 7,809.72, 10,780.92 and 4,980.90

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Solution

The fourth proportional to 7,809.72, 10,780.92 and 4,980.90 is: 6,875.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,809.72 : 10,780.92 = 4,980.90 : x
  2. Step 2: Convert to fraction form
    7,809.72/10,780.92 = 4,980.90/x
  3. Step 3: Cross multiply
    7,809.72x = 10,780.92 × 4,980.90
  4. Step 4: Simplify right side
    7,809.72x = 53,698,684.43
  5. Step 5: Solve for x
    x = 53,698,684.43/7,809.72
  6. Step 6: Final answer
    x = 6,875.88

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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.