Home / 21,011.72-28,996.12-11,580.28

Finding the Fourth Proportional to 21,011.72, 28,996.12 and 11,580.28

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Solution

The fourth proportional to 21,011.72, 28,996.12 and 11,580.28 is: 15,980.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.72 : 28,996.12 = 11,580.28 : x
  2. Step 2: Convert to fraction form
    21,011.72/28,996.12 = 11,580.28/x
  3. Step 3: Cross multiply
    21,011.72x = 28,996.12 × 11,580.28
  4. Step 4: Simplify right side
    21,011.72x = 335,783,130.61
  5. Step 5: Solve for x
    x = 335,783,130.61/21,011.72
  6. Step 6: Final answer
    x = 15,980.75

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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.