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Finding the Fourth Proportional to 6,390.42, 8,816.18 and 4,031.18

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Solution

The fourth proportional to 6,390.42, 8,816.18 and 4,031.18 is: 5,561.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.42 : 8,816.18 = 4,031.18 : x
  2. Step 2: Convert to fraction form
    6,390.42/8,816.18 = 4,031.18/x
  3. Step 3: Cross multiply
    6,390.42x = 8,816.18 × 4,031.18
  4. Step 4: Simplify right side
    6,390.42x = 35,539,608.49
  5. Step 5: Solve for x
    x = 35,539,608.49/6,390.42
  6. Step 6: Final answer
    x = 5,561.39

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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.