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Finding the Fourth Proportional to 860.15, 1,290.47 and 449.55

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Solution

The fourth proportional to 860.15, 1,290.47 and 449.55 is: 674.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.15 : 1,290.47 = 449.55 : x
  2. Step 2: Convert to fraction form
    860.15/1,290.47 = 449.55/x
  3. Step 3: Cross multiply
    860.15x = 1,290.47 × 449.55
  4. Step 4: Simplify right side
    860.15x = 580,128.54
  5. Step 5: Solve for x
    x = 580,128.54/860.15
  6. Step 6: Final answer
    x = 674.45

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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.