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Finding the Fourth Proportional to 4,978.71, 6,869.62 and 2,854.91

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Solution

The fourth proportional to 4,978.71, 6,869.62 and 2,854.91 is: 3,939.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,978.71 : 6,869.62 = 2,854.91 : x
  2. Step 2: Convert to fraction form
    4,978.71/6,869.62 = 2,854.91/x
  3. Step 3: Cross multiply
    4,978.71x = 6,869.62 × 2,854.91
  4. Step 4: Simplify right side
    4,978.71x = 19,612,146.83
  5. Step 5: Solve for x
    x = 19,612,146.83/4,978.71
  6. Step 6: Final answer
    x = 3,939.20

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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.