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Finding the Fourth Proportional to 1,275.75, 1,913.82 and 1,055.09

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Solution

The fourth proportional to 1,275.75, 1,913.82 and 1,055.09 is: 1,582.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.75 : 1,913.82 = 1,055.09 : x
  2. Step 2: Convert to fraction form
    1,275.75/1,913.82 = 1,055.09/x
  3. Step 3: Cross multiply
    1,275.75x = 1,913.82 × 1,055.09
  4. Step 4: Simplify right side
    1,275.75x = 2,019,252.34
  5. Step 5: Solve for x
    x = 2,019,252.34/1,275.75
  6. Step 6: Final answer
    x = 1,582.80

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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.