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Finding the Fourth Proportional to 4,878.13, 6,731.78 and 2,639.99

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Solution

The fourth proportional to 4,878.13, 6,731.78 and 2,639.99 is: 3,643.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,878.13 : 6,731.78 = 2,639.99 : x
  2. Step 2: Convert to fraction form
    4,878.13/6,731.78 = 2,639.99/x
  3. Step 3: Cross multiply
    4,878.13x = 6,731.78 × 2,639.99
  4. Step 4: Simplify right side
    4,878.13x = 17,771,798.22
  5. Step 5: Solve for x
    x = 17,771,798.22/4,878.13
  6. Step 6: Final answer
    x = 3,643.16

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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.