Home / 1,291.47-1,780.92-1,105.58

Finding the Fourth Proportional to 1,291.47, 1,780.92 and 1,105.58

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Solution

The fourth proportional to 1,291.47, 1,780.92 and 1,105.58 is: 1,524.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.47 : 1,780.92 = 1,105.58 : x
  2. Step 2: Convert to fraction form
    1,291.47/1,780.92 = 1,105.58/x
  3. Step 3: Cross multiply
    1,291.47x = 1,780.92 × 1,105.58
  4. Step 4: Simplify right side
    1,291.47x = 1,968,940.63
  5. Step 5: Solve for x
    x = 1,968,940.63/1,291.47
  6. Step 6: Final answer
    x = 1,524.57

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1.5x scale

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.