Home / 8,139.40-12,176.70-7,361.80

Finding the Fourth Proportional to 8,139.40, 12,176.70 and 7,361.80

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Solution

The fourth proportional to 8,139.40, 12,176.70 and 7,361.80 is: 11,013.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.40 : 12,176.70 = 7,361.80 : x
  2. Step 2: Convert to fraction form
    8,139.40/12,176.70 = 7,361.80/x
  3. Step 3: Cross multiply
    8,139.40x = 12,176.70 × 7,361.80
  4. Step 4: Simplify right side
    8,139.40x = 89,642,430.06
  5. Step 5: Solve for x
    x = 89,642,430.06/8,139.40
  6. Step 6: Final answer
    x = 11,013.40

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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.