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Finding the Fourth Proportional to 21,808.80, 30,079.08 and 18,460.80

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Solution

The fourth proportional to 21,808.80, 30,079.08 and 18,460.80 is: 25,461.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808.80 : 30,079.08 = 18,460.80 : x
  2. Step 2: Convert to fraction form
    21,808.80/30,079.08 = 18,460.80/x
  3. Step 3: Cross multiply
    21,808.80x = 30,079.08 × 18,460.80
  4. Step 4: Simplify right side
    21,808.80x = 555,283,880.06
  5. Step 5: Solve for x
    x = 555,283,880.06/21,808.80
  6. Step 6: Final answer
    x = 25,461.46

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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.