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Finding the Fourth Proportional to 6,291.47, 8,681.88 and 3,639.74

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Solution

The fourth proportional to 6,291.47, 8,681.88 and 3,639.74 is: 5,022.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,291.47 : 8,681.88 = 3,639.74 : x
  2. Step 2: Convert to fraction form
    6,291.47/8,681.88 = 3,639.74/x
  3. Step 3: Cross multiply
    6,291.47x = 8,681.88 × 3,639.74
  4. Step 4: Simplify right side
    6,291.47x = 31,599,756.15
  5. Step 5: Solve for x
    x = 31,599,756.15/6,291.47
  6. Step 6: Final answer
    x = 5,022.63

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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.