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Finding the Fourth Proportional to 4,800.78, 7,200.60 and 1,291.06

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Solution

The fourth proportional to 4,800.78, 7,200.60 and 1,291.06 is: 1,936.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,800.78 : 7,200.60 = 1,291.06 : x
  2. Step 2: Convert to fraction form
    4,800.78/7,200.60 = 1,291.06/x
  3. Step 3: Cross multiply
    4,800.78x = 7,200.60 × 1,291.06
  4. Step 4: Simplify right side
    4,800.78x = 9,296,406.64
  5. Step 5: Solve for x
    x = 9,296,406.64/4,800.78
  6. Step 6: Final answer
    x = 1,936.44

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1.5x scale

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.