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Finding the Fourth Proportional to 9,328.80, 13,996.40 and 4,138.40

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Solution

The fourth proportional to 9,328.80, 13,996.40 and 4,138.40 is: 6,209.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,328.80 : 13,996.40 = 4,138.40 : x
  2. Step 2: Convert to fraction form
    9,328.80/13,996.40 = 4,138.40/x
  3. Step 3: Cross multiply
    9,328.80x = 13,996.40 × 4,138.40
  4. Step 4: Simplify right side
    9,328.80x = 57,922,701.76
  5. Step 5: Solve for x
    x = 57,922,701.76/9,328.80
  6. Step 6: Final answer
    x = 6,209.02

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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.