Home / 21,002.40-28,987.28-13,047.84

Finding the Fourth Proportional to 21,002.40, 28,987.28 and 13,047.84

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Solution

The fourth proportional to 21,002.40, 28,987.28 and 13,047.84 is: 18,008.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,002.40 : 28,987.28 = 13,047.84 : x
  2. Step 2: Convert to fraction form
    21,002.40/28,987.28 = 13,047.84/x
  3. Step 3: Cross multiply
    21,002.40x = 28,987.28 × 13,047.84
  4. Step 4: Simplify right side
    21,002.40x = 378,221,391.48
  5. Step 5: Solve for x
    x = 378,221,391.48/21,002.40
  6. Step 6: Final answer
    x = 18,008.48

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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.