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Finding the Fourth Proportional to 85,662.88, 128,261.04 and 66,621.40

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Solution

The fourth proportional to 85,662.88, 128,261.04 and 66,621.40 is: 99,750.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,662.88 : 128,261.04 = 66,621.40 : x
  2. Step 2: Convert to fraction form
    85,662.88/128,261.04 = 66,621.40/x
  3. Step 3: Cross multiply
    85,662.88x = 128,261.04 × 66,621.40
  4. Step 4: Simplify right side
    85,662.88x = 8,544,930,050.26
  5. Step 5: Solve for x
    x = 8,544,930,050.26/85,662.88
  6. Step 6: Final answer
    x = 99,750.67

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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.