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Finding the Fourth Proportional to 1,415.90, 2,121.80 and 798.29

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Solution

The fourth proportional to 1,415.90, 2,121.80 and 798.29 is: 1,196.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.90 : 2,121.80 = 798.29 : x
  2. Step 2: Convert to fraction form
    1,415.90/2,121.80 = 798.29/x
  3. Step 3: Cross multiply
    1,415.90x = 2,121.80 × 798.29
  4. Step 4: Simplify right side
    1,415.90x = 1,693,803.92
  5. Step 5: Solve for x
    x = 1,693,803.92/1,415.90
  6. Step 6: Final answer
    x = 1,196.27

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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.