Home / 21,320.74-31,939.55-12,980.07

Finding the Fourth Proportional to 21,320.74, 31,939.55 and 12,980.07

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Solution

The fourth proportional to 21,320.74, 31,939.55 and 12,980.07 is: 19,444.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.74 : 31,939.55 = 12,980.07 : x
  2. Step 2: Convert to fraction form
    21,320.74/31,939.55 = 12,980.07/x
  3. Step 3: Cross multiply
    21,320.74x = 31,939.55 × 12,980.07
  4. Step 4: Simplify right side
    21,320.74x = 414,577,627.22
  5. Step 5: Solve for x
    x = 414,577,627.22/21,320.74
  6. Step 6: Final answer
    x = 19,444.80

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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.