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Finding the Fourth Proportional to 1,074.40, 1,482.78 and 681.46

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Solution

The fourth proportional to 1,074.40, 1,482.78 and 681.46 is: 940.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.40 : 1,482.78 = 681.46 : x
  2. Step 2: Convert to fraction form
    1,074.40/1,482.78 = 681.46/x
  3. Step 3: Cross multiply
    1,074.40x = 1,482.78 × 681.46
  4. Step 4: Simplify right side
    1,074.40x = 1,010,455.26
  5. Step 5: Solve for x
    x = 1,010,455.26/1,074.40
  6. Step 6: Final answer
    x = 940.48

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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.