Home / 21,988.09-30,345.75-12,558.07

Finding the Fourth Proportional to 21,988.09, 30,345.75 and 12,558.07

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Solution

The fourth proportional to 21,988.09, 30,345.75 and 12,558.07 is: 17,331.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.09 : 30,345.75 = 12,558.07 : x
  2. Step 2: Convert to fraction form
    21,988.09/30,345.75 = 12,558.07/x
  3. Step 3: Cross multiply
    21,988.09x = 30,345.75 × 12,558.07
  4. Step 4: Simplify right side
    21,988.09x = 381,084,052.70
  5. Step 5: Solve for x
    x = 381,084,052.70/21,988.09
  6. Step 6: Final answer
    x = 17,331.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.