Home / 21,740.40-30,001.68-12,309.12

Finding the Fourth Proportional to 21,740.40, 30,001.68 and 12,309.12

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Solution

The fourth proportional to 21,740.40, 30,001.68 and 12,309.12 is: 16,986.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,740.40 : 30,001.68 = 12,309.12 : x
  2. Step 2: Convert to fraction form
    21,740.40/30,001.68 = 12,309.12/x
  3. Step 3: Cross multiply
    21,740.40x = 30,001.68 × 12,309.12
  4. Step 4: Simplify right side
    21,740.40x = 369,294,279.32
  5. Step 5: Solve for x
    x = 369,294,279.32/21,740.40
  6. Step 6: Final answer
    x = 16,986.54

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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.