Home / 21,078.40-31,618.14-9,982.48

Finding the Fourth Proportional to 21,078.40, 31,618.14 and 9,982.48

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Solution

The fourth proportional to 21,078.40, 31,618.14 and 9,982.48 is: 14,973.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.40 : 31,618.14 = 9,982.48 : x
  2. Step 2: Convert to fraction form
    21,078.40/31,618.14 = 9,982.48/x
  3. Step 3: Cross multiply
    21,078.40x = 31,618.14 × 9,982.48
  4. Step 4: Simplify right side
    21,078.40x = 315,627,450.19
  5. Step 5: Solve for x
    x = 315,627,450.19/21,078.40
  6. Step 6: Final answer
    x = 14,973.98

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1.5x scale

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.