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Finding the Fourth Proportional to 6,390.27, 8,818.76 and 3,999.48

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Solution

The fourth proportional to 6,390.27, 8,818.76 and 3,999.48 is: 5,519.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.27 : 8,818.76 = 3,999.48 : x
  2. Step 2: Convert to fraction form
    6,390.27/8,818.76 = 3,999.48/x
  3. Step 3: Cross multiply
    6,390.27x = 8,818.76 × 3,999.48
  4. Step 4: Simplify right side
    6,390.27x = 35,270,454.24
  5. Step 5: Solve for x
    x = 35,270,454.24/6,390.27
  6. Step 6: Final answer
    x = 5,519.40

Related Problems

Find fourth proportional to 3,195.14, 4,409.38 and 1,999.74
Half scale
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Double scale
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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.