Home / 21,006.96-28,989.12-12,623.28

Finding the Fourth Proportional to 21,006.96, 28,989.12 and 12,623.28

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Solution

The fourth proportional to 21,006.96, 28,989.12 and 12,623.28 is: 17,419.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.96 : 28,989.12 = 12,623.28 : x
  2. Step 2: Convert to fraction form
    21,006.96/28,989.12 = 12,623.28/x
  3. Step 3: Cross multiply
    21,006.96x = 28,989.12 × 12,623.28
  4. Step 4: Simplify right side
    21,006.96x = 365,937,778.71
  5. Step 5: Solve for x
    x = 365,937,778.71/21,006.96
  6. Step 6: Final answer
    x = 17,419.84

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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.