Home / 13,880.40-20,830.20-9,987.60

Finding the Fourth Proportional to 13,880.40, 20,830.20 and 9,987.60

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Solution

The fourth proportional to 13,880.40, 20,830.20 and 9,987.60 is: 14,988.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,880.40 : 20,830.20 = 9,987.60 : x
  2. Step 2: Convert to fraction form
    13,880.40/20,830.20 = 9,987.60/x
  3. Step 3: Cross multiply
    13,880.40x = 20,830.20 × 9,987.60
  4. Step 4: Simplify right side
    13,880.40x = 208,043,705.52
  5. Step 5: Solve for x
    x = 208,043,705.52/13,880.40
  6. Step 6: Final answer
    x = 14,988.31

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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.