Home / 2,155.90-2,975.13-1,224.40

Finding the Fourth Proportional to 2,155.90, 2,975.13 and 1,224.40

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Solution

The fourth proportional to 2,155.90, 2,975.13 and 1,224.40 is: 1,689.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.90 : 2,975.13 = 1,224.40 : x
  2. Step 2: Convert to fraction form
    2,155.90/2,975.13 = 1,224.40/x
  3. Step 3: Cross multiply
    2,155.90x = 2,975.13 × 1,224.40
  4. Step 4: Simplify right side
    2,155.90x = 3,642,749.17
  5. Step 5: Solve for x
    x = 3,642,749.17/2,155.90
  6. Step 6: Final answer
    x = 1,689.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.