Home / 13,988.08-20,980.32-4,128.40

Finding the Fourth Proportional to 13,988.08, 20,980.32 and 4,128.40

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Solution

The fourth proportional to 13,988.08, 20,980.32 and 4,128.40 is: 6,192.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988.08 : 20,980.32 = 4,128.40 : x
  2. Step 2: Convert to fraction form
    13,988.08/20,980.32 = 4,128.40/x
  3. Step 3: Cross multiply
    13,988.08x = 20,980.32 × 4,128.40
  4. Step 4: Simplify right side
    13,988.08x = 86,615,153.09
  5. Step 5: Solve for x
    x = 86,615,153.09/13,988.08
  6. Step 6: Final answer
    x = 6,192.07

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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.