Home / 21,189.90-31,698.45-19,116.30

Finding the Fourth Proportional to 21,189.90, 31,698.45 and 19,116.30

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Solution

The fourth proportional to 21,189.90, 31,698.45 and 19,116.30 is: 28,596.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189.90 : 31,698.45 = 19,116.30 : x
  2. Step 2: Convert to fraction form
    21,189.90/31,698.45 = 19,116.30/x
  3. Step 3: Cross multiply
    21,189.90x = 31,698.45 × 19,116.30
  4. Step 4: Simplify right side
    21,189.90x = 605,957,079.74
  5. Step 5: Solve for x
    x = 605,957,079.74/21,189.90
  6. Step 6: Final answer
    x = 28,596.50

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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.