Home / 21,005.12-28,977.21-12,502.42

Finding the Fourth Proportional to 21,005.12, 28,977.21 and 12,502.42

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Solution

The fourth proportional to 21,005.12, 28,977.21 and 12,502.42 is: 17,247.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.12 : 28,977.21 = 12,502.42 : x
  2. Step 2: Convert to fraction form
    21,005.12/28,977.21 = 12,502.42/x
  3. Step 3: Cross multiply
    21,005.12x = 28,977.21 × 12,502.42
  4. Step 4: Simplify right side
    21,005.12x = 362,285,177.41
  5. Step 5: Solve for x
    x = 362,285,177.41/21,005.12
  6. Step 6: Final answer
    x = 17,247.47

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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.