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Finding the Fourth Proportional to 7,840.04, 10,819.20 and 4,255.00

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Solution

The fourth proportional to 7,840.04, 10,819.20 and 4,255.00 is: 5,871.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,840.04 : 10,819.20 = 4,255.00 : x
  2. Step 2: Convert to fraction form
    7,840.04/10,819.20 = 4,255.00/x
  3. Step 3: Cross multiply
    7,840.04x = 10,819.20 × 4,255.00
  4. Step 4: Simplify right side
    7,840.04x = 46,035,684.91
  5. Step 5: Solve for x
    x = 46,035,684.91/7,840.04
  6. Step 6: Final answer
    x = 5,871.87

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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.