Home / 1,445.40-2,162.70-1,315.80

Finding the Fourth Proportional to 1,445.40, 2,162.70 and 1,315.80

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Solution

The fourth proportional to 1,445.40, 2,162.70 and 1,315.80 is: 1,968.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.40 : 2,162.70 = 1,315.80 : x
  2. Step 2: Convert to fraction form
    1,445.40/2,162.70 = 1,315.80/x
  3. Step 3: Cross multiply
    1,445.40x = 2,162.70 × 1,315.80
  4. Step 4: Simplify right side
    1,445.40x = 2,845,680.66
  5. Step 5: Solve for x
    x = 2,845,680.66/1,445.40
  6. Step 6: Final answer
    x = 1,968.78

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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.