Home / 9,428.40-12,990.60-6,279.12

Finding the Fourth Proportional to 9,428.40, 12,990.60 and 6,279.12

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Solution

The fourth proportional to 9,428.40, 12,990.60 and 6,279.12 is: 8,651.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,428.40 : 12,990.60 = 6,279.12 : x
  2. Step 2: Convert to fraction form
    9,428.40/12,990.60 = 6,279.12/x
  3. Step 3: Cross multiply
    9,428.40x = 12,990.60 × 6,279.12
  4. Step 4: Simplify right side
    9,428.40x = 81,569,536.27
  5. Step 5: Solve for x
    x = 81,569,536.27/9,428.40
  6. Step 6: Final answer
    x = 8,651.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.