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Finding the Fourth Proportional to 4,679.70, 7,019.40 and 1,392.78

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Solution

The fourth proportional to 4,679.70, 7,019.40 and 1,392.78 is: 2,089.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,679.70 : 7,019.40 = 1,392.78 : x
  2. Step 2: Convert to fraction form
    4,679.70/7,019.40 = 1,392.78/x
  3. Step 3: Cross multiply
    4,679.70x = 7,019.40 × 1,392.78
  4. Step 4: Simplify right side
    4,679.70x = 9,776,479.93
  5. Step 5: Solve for x
    x = 9,776,479.93/4,679.70
  6. Step 6: Final answer
    x = 2,089.13

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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.