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Finding the Fourth Proportional to 21,004.79, 28,987.20 and 12,053.88

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Solution

The fourth proportional to 21,004.79, 28,987.20 and 12,053.88 is: 16,634.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,004.79 : 28,987.20 = 12,053.88 : x
  2. Step 2: Convert to fraction form
    21,004.79/28,987.20 = 12,053.88/x
  3. Step 3: Cross multiply
    21,004.79x = 28,987.20 × 12,053.88
  4. Step 4: Simplify right side
    21,004.79x = 349,408,230.34
  5. Step 5: Solve for x
    x = 349,408,230.34/21,004.79
  6. Step 6: Final answer
    x = 16,634.70

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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.