Home / 19,987.35-29,980.88-6,661.36

Finding the Fourth Proportional to 19,987.35, 29,980.88 and 6,661.36

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Solution

The fourth proportional to 19,987.35, 29,980.88 and 6,661.36 is: 9,991.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.35 : 29,980.88 = 6,661.36 : x
  2. Step 2: Convert to fraction form
    19,987.35/29,980.88 = 6,661.36/x
  3. Step 3: Cross multiply
    19,987.35x = 29,980.88 × 6,661.36
  4. Step 4: Simplify right side
    19,987.35x = 199,713,434.80
  5. Step 5: Solve for x
    x = 199,713,434.80/19,987.35
  6. Step 6: Final answer
    x = 9,991.99

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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.