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Finding the Fourth Proportional to 85,988.34, 128,829.36 and 73,380.24

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Solution

The fourth proportional to 85,988.34, 128,829.36 and 73,380.24 is: 109,939.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,988.34 : 128,829.36 = 73,380.24 : x
  2. Step 2: Convert to fraction form
    85,988.34/128,829.36 = 73,380.24/x
  3. Step 3: Cross multiply
    85,988.34x = 128,829.36 × 73,380.24
  4. Step 4: Simplify right side
    85,988.34x = 9,453,529,355.85
  5. Step 5: Solve for x
    x = 9,453,529,355.85/85,988.34
  6. Step 6: Final answer
    x = 109,939.67

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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.