Home / 1,420.35-2,130.57-1,213.62

Finding the Fourth Proportional to 1,420.35, 2,130.57 and 1,213.62

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Solution

The fourth proportional to 1,420.35, 2,130.57 and 1,213.62 is: 1,820.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.35 : 2,130.57 = 1,213.62 : x
  2. Step 2: Convert to fraction form
    1,420.35/2,130.57 = 1,213.62/x
  3. Step 3: Cross multiply
    1,420.35x = 2,130.57 × 1,213.62
  4. Step 4: Simplify right side
    1,420.35x = 2,585,702.36
  5. Step 5: Solve for x
    x = 2,585,702.36/1,420.35
  6. Step 6: Final answer
    x = 1,820.47

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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.