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Finding the Fourth Proportional to 8,485.70, 11,710.40 and 5,128.06

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Solution

The fourth proportional to 8,485.70, 11,710.40 and 5,128.06 is: 7,076.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,485.70 : 11,710.40 = 5,128.06 : x
  2. Step 2: Convert to fraction form
    8,485.70/11,710.40 = 5,128.06/x
  3. Step 3: Cross multiply
    8,485.70x = 11,710.40 × 5,128.06
  4. Step 4: Simplify right side
    8,485.70x = 60,051,633.82
  5. Step 5: Solve for x
    x = 60,051,633.82/8,485.70
  6. Step 6: Final answer
    x = 7,076.80

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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.