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Finding the Fourth Proportional to 20,875.92, 28,809.95 and 12,383.07

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Solution

The fourth proportional to 20,875.92, 28,809.95 and 12,383.07 is: 17,089.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,875.92 : 28,809.95 = 12,383.07 : x
  2. Step 2: Convert to fraction form
    20,875.92/28,809.95 = 12,383.07/x
  3. Step 3: Cross multiply
    20,875.92x = 28,809.95 × 12,383.07
  4. Step 4: Simplify right side
    20,875.92x = 356,755,514.45
  5. Step 5: Solve for x
    x = 356,755,514.45/20,875.92
  6. Step 6: Final answer
    x = 17,089.34

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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.