Home / 19,986.40-29,979.60-9,618.40

Finding the Fourth Proportional to 19,986.40, 29,979.60 and 9,618.40

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Solution

The fourth proportional to 19,986.40, 29,979.60 and 9,618.40 is: 14,427.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,986.40 : 29,979.60 = 9,618.40 : x
  2. Step 2: Convert to fraction form
    19,986.40/29,979.60 = 9,618.40/x
  3. Step 3: Cross multiply
    19,986.40x = 29,979.60 × 9,618.40
  4. Step 4: Simplify right side
    19,986.40x = 288,355,784.64
  5. Step 5: Solve for x
    x = 288,355,784.64/19,986.40
  6. Step 6: Final answer
    x = 14,427.60

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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.