Home / 13,890.90-20,821.77-9,993.18

Finding the Fourth Proportional to 13,890.90, 20,821.77 and 9,993.18

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Solution

The fourth proportional to 13,890.90, 20,821.77 and 9,993.18 is: 14,979.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.90 : 20,821.77 = 9,993.18 : x
  2. Step 2: Convert to fraction form
    13,890.90/20,821.77 = 9,993.18/x
  3. Step 3: Cross multiply
    13,890.90x = 20,821.77 × 9,993.18
  4. Step 4: Simplify right side
    13,890.90x = 208,075,695.53
  5. Step 5: Solve for x
    x = 208,075,695.53/13,890.90
  6. Step 6: Final answer
    x = 14,979.28

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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.