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Finding the Fourth Proportional to 4,679.40, 7,019.40 and 1,392.21

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Solution

The fourth proportional to 4,679.40, 7,019.40 and 1,392.21 is: 2,088.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,679.40 : 7,019.40 = 1,392.21 : x
  2. Step 2: Convert to fraction form
    4,679.40/7,019.40 = 1,392.21/x
  3. Step 3: Cross multiply
    4,679.40x = 7,019.40 × 1,392.21
  4. Step 4: Simplify right side
    4,679.40x = 9,772,505.20
  5. Step 5: Solve for x
    x = 9,772,505.20/4,679.40
  6. Step 6: Final answer
    x = 2,088.41

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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.