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Finding the Fourth Proportional to 7,800.78, 11,700.72 and 2,868.18

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Solution

The fourth proportional to 7,800.78, 11,700.72 and 2,868.18 is: 4,302.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,800.78 : 11,700.72 = 2,868.18 : x
  2. Step 2: Convert to fraction form
    7,800.78/11,700.72 = 2,868.18/x
  3. Step 3: Cross multiply
    7,800.78x = 11,700.72 × 2,868.18
  4. Step 4: Simplify right side
    7,800.78x = 33,559,771.09
  5. Step 5: Solve for x
    x = 33,559,771.09/7,800.78
  6. Step 6: Final answer
    x = 4,302.10

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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.