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Finding the Fourth Proportional to 2,688.80, 4,032.36 and 957

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Solution

The fourth proportional to 2,688.80, 4,032.36 and 957 is: 1,435.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.80 : 4,032.36 = 957 : x
  2. Step 2: Convert to fraction form
    2,688.80/4,032.36 = 957/x
  3. Step 3: Cross multiply
    2,688.80x = 4,032.36 × 957
  4. Step 4: Simplify right side
    2,688.80x = 3,858,968.52
  5. Step 5: Solve for x
    x = 3,858,968.52/2,688.80
  6. Step 6: Final answer
    x = 1,435.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.