Home / 12,931.02-19,380.60-7,660.80

Finding the Fourth Proportional to 12,931.02, 19,380.60 and 7,660.80

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Solution

The fourth proportional to 12,931.02, 19,380.60 and 7,660.80 is: 11,481.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,931.02 : 19,380.60 = 7,660.80 : x
  2. Step 2: Convert to fraction form
    12,931.02/19,380.60 = 7,660.80/x
  3. Step 3: Cross multiply
    12,931.02x = 19,380.60 × 7,660.80
  4. Step 4: Simplify right side
    12,931.02x = 148,470,900.48
  5. Step 5: Solve for x
    x = 148,470,900.48/12,931.02
  6. Step 6: Final answer
    x = 11,481.76

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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.