Home / 21,011.47-28,995.77-11,580.03

Finding the Fourth Proportional to 21,011.47, 28,995.77 and 11,580.03

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Solution

The fourth proportional to 21,011.47, 28,995.77 and 11,580.03 is: 15,980.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.47 : 28,995.77 = 11,580.03 : x
  2. Step 2: Convert to fraction form
    21,011.47/28,995.77 = 11,580.03/x
  3. Step 3: Cross multiply
    21,011.47x = 28,995.77 × 11,580.03
  4. Step 4: Simplify right side
    21,011.47x = 335,771,886.47
  5. Step 5: Solve for x
    x = 335,771,886.47/21,011.47
  6. Step 6: Final answer
    x = 15,980.41

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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.