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Finding the Fourth Proportional to 7,840.80, 10,821.60 and 4,698.72

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Solution

The fourth proportional to 7,840.80, 10,821.60 and 4,698.72 is: 6,485.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,840.80 : 10,821.60 = 4,698.72 : x
  2. Step 2: Convert to fraction form
    7,840.80/10,821.60 = 4,698.72/x
  3. Step 3: Cross multiply
    7,840.80x = 10,821.60 × 4,698.72
  4. Step 4: Simplify right side
    7,840.80x = 50,847,668.35
  5. Step 5: Solve for x
    x = 50,847,668.35/7,840.80
  6. Step 6: Final answer
    x = 6,485.01

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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.