Home / 5,138.60-7,705.74-2,215.40

Finding the Fourth Proportional to 5,138.60, 7,705.74 and 2,215.40

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Solution

The fourth proportional to 5,138.60, 7,705.74 and 2,215.40 is: 3,322.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.60 : 7,705.74 = 2,215.40 : x
  2. Step 2: Convert to fraction form
    5,138.60/7,705.74 = 2,215.40/x
  3. Step 3: Cross multiply
    5,138.60x = 7,705.74 × 2,215.40
  4. Step 4: Simplify right side
    5,138.60x = 17,071,296.40
  5. Step 5: Solve for x
    x = 17,071,296.40/5,138.60
  6. Step 6: Final answer
    x = 3,322.17

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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.