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Finding the Fourth Proportional to 85,830.40, 128,745.60 and 26,665.60

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Solution

The fourth proportional to 85,830.40, 128,745.60 and 26,665.60 is: 39,998.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,830.40 : 128,745.60 = 26,665.60 : x
  2. Step 2: Convert to fraction form
    85,830.40/128,745.60 = 26,665.60/x
  3. Step 3: Cross multiply
    85,830.40x = 128,745.60 × 26,665.60
  4. Step 4: Simplify right side
    85,830.40x = 3,433,078,671.36
  5. Step 5: Solve for x
    x = 3,433,078,671.36/85,830.40
  6. Step 6: Final answer
    x = 39,998.40

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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.