Home / 8,428.23-12,642.31-2,187.72

Finding the Fourth Proportional to 8,428.23, 12,642.31 and 2,187.72

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Solution

The fourth proportional to 8,428.23, 12,642.31 and 2,187.72 is: 3,281.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.23 : 12,642.31 = 2,187.72 : x
  2. Step 2: Convert to fraction form
    8,428.23/12,642.31 = 2,187.72/x
  3. Step 3: Cross multiply
    8,428.23x = 12,642.31 × 2,187.72
  4. Step 4: Simplify right side
    8,428.23x = 27,657,834.43
  5. Step 5: Solve for x
    x = 27,657,834.43/8,428.23
  6. Step 6: Final answer
    x = 3,281.57

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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.