Home / 21,987.90-33,030.45-21,161.70

Finding the Fourth Proportional to 21,987.90, 33,030.45 and 21,161.70

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Solution

The fourth proportional to 21,987.90, 33,030.45 and 21,161.70 is: 31,789.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.90 : 33,030.45 = 21,161.70 : x
  2. Step 2: Convert to fraction form
    21,987.90/33,030.45 = 21,161.70/x
  3. Step 3: Cross multiply
    21,987.90x = 33,030.45 × 21,161.70
  4. Step 4: Simplify right side
    21,987.90x = 698,980,473.77
  5. Step 5: Solve for x
    x = 698,980,473.77/21,987.90
  6. Step 6: Final answer
    x = 31,789.32

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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.