Home / 7,138.90-10,712.16-2,981.74

Finding the Fourth Proportional to 7,138.90, 10,712.16 and 2,981.74

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Solution

The fourth proportional to 7,138.90, 10,712.16 and 2,981.74 is: 4,474.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.90 : 10,712.16 = 2,981.74 : x
  2. Step 2: Convert to fraction form
    7,138.90/10,712.16 = 2,981.74/x
  3. Step 3: Cross multiply
    7,138.90x = 10,712.16 × 2,981.74
  4. Step 4: Simplify right side
    7,138.90x = 31,940,875.96
  5. Step 5: Solve for x
    x = 31,940,875.96/7,138.90
  6. Step 6: Final answer
    x = 4,474.20

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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.