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Finding the Fourth Proportional to 5,298.40, 7,940.80 and 2,958.40

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Solution

The fourth proportional to 5,298.40, 7,940.80 and 2,958.40 is: 4,433.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,298.40 : 7,940.80 = 2,958.40 : x
  2. Step 2: Convert to fraction form
    5,298.40/7,940.80 = 2,958.40/x
  3. Step 3: Cross multiply
    5,298.40x = 7,940.80 × 2,958.40
  4. Step 4: Simplify right side
    5,298.40x = 23,492,062.72
  5. Step 5: Solve for x
    x = 23,492,062.72/5,298.40
  6. Step 6: Final answer
    x = 4,433.80

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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.