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Finding the Fourth Proportional to 9,810.40, 14,704.80 and 5,128.60

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Solution

The fourth proportional to 9,810.40, 14,704.80 and 5,128.60 is: 7,687.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,810.40 : 14,704.80 = 5,128.60 : x
  2. Step 2: Convert to fraction form
    9,810.40/14,704.80 = 5,128.60/x
  3. Step 3: Cross multiply
    9,810.40x = 14,704.80 × 5,128.60
  4. Step 4: Simplify right side
    9,810.40x = 75,415,037.28
  5. Step 5: Solve for x
    x = 75,415,037.28/9,810.40
  6. Step 6: Final answer
    x = 7,687.25

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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.