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Finding the Fourth Proportional to 85,816.90, 128,725.35 and 57,750.40

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Solution

The fourth proportional to 85,816.90, 128,725.35 and 57,750.40 is: 86,625.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,816.90 : 128,725.35 = 57,750.40 : x
  2. Step 2: Convert to fraction form
    85,816.90/128,725.35 = 57,750.40/x
  3. Step 3: Cross multiply
    85,816.90x = 128,725.35 × 57,750.40
  4. Step 4: Simplify right side
    85,816.90x = 7,433,940,452.64
  5. Step 5: Solve for x
    x = 7,433,940,452.64/85,816.90
  6. Step 6: Final answer
    x = 86,625.60

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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.