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Finding the Fourth Proportional to 86,610.30, 129,915.45 and 80,130.30

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Solution

The fourth proportional to 86,610.30, 129,915.45 and 80,130.30 is: 120,195.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,610.30 : 129,915.45 = 80,130.30 : x
  2. Step 2: Convert to fraction form
    86,610.30/129,915.45 = 80,130.30/x
  3. Step 3: Cross multiply
    86,610.30x = 129,915.45 × 80,130.30
  4. Step 4: Simplify right side
    86,610.30x = 10,410,163,983.14
  5. Step 5: Solve for x
    x = 10,410,163,983.14/86,610.30
  6. Step 6: Final answer
    x = 120,195.45

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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.