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Finding the Fourth Proportional to 8,957.68, 12,361.74 and 4,979.20

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Solution

The fourth proportional to 8,957.68, 12,361.74 and 4,979.20 is: 6,871.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,957.68 : 12,361.74 = 4,979.20 : x
  2. Step 2: Convert to fraction form
    8,957.68/12,361.74 = 4,979.20/x
  3. Step 3: Cross multiply
    8,957.68x = 12,361.74 × 4,979.20
  4. Step 4: Simplify right side
    8,957.68x = 61,551,575.81
  5. Step 5: Solve for x
    x = 61,551,575.81/8,957.68
  6. Step 6: Final answer
    x = 6,871.37

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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.