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Finding the Fourth Proportional to 1,391.41, 1,920.14 and 801.94

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Solution

The fourth proportional to 1,391.41, 1,920.14 and 801.94 is: 1,106.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.41 : 1,920.14 = 801.94 : x
  2. Step 2: Convert to fraction form
    1,391.41/1,920.14 = 801.94/x
  3. Step 3: Cross multiply
    1,391.41x = 1,920.14 × 801.94
  4. Step 4: Simplify right side
    1,391.41x = 1,539,837.07
  5. Step 5: Solve for x
    x = 1,539,837.07/1,391.41
  6. Step 6: Final answer
    x = 1,106.68

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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.