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Finding the Fourth Proportional to 862.89, 1,190.71 and 484.77

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Solution

The fourth proportional to 862.89, 1,190.71 and 484.77 is: 668.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.89 : 1,190.71 = 484.77 : x
  2. Step 2: Convert to fraction form
    862.89/1,190.71 = 484.77/x
  3. Step 3: Cross multiply
    862.89x = 1,190.71 × 484.77
  4. Step 4: Simplify right side
    862.89x = 577,220.49
  5. Step 5: Solve for x
    x = 577,220.49/862.89
  6. Step 6: Final answer
    x = 668.94

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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.