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Finding the Fourth Proportional to 6,386.88, 8,811.36 and 3,904.32

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Solution

The fourth proportional to 6,386.88, 8,811.36 and 3,904.32 is: 5,386.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,386.88 : 8,811.36 = 3,904.32 : x
  2. Step 2: Convert to fraction form
    6,386.88/8,811.36 = 3,904.32/x
  3. Step 3: Cross multiply
    6,386.88x = 8,811.36 × 3,904.32
  4. Step 4: Simplify right side
    6,386.88x = 34,402,369.08
  5. Step 5: Solve for x
    x = 34,402,369.08/6,386.88
  6. Step 6: Final answer
    x = 5,386.41

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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.