Home / 20,885.84-28,824-11,455.28

Finding the Fourth Proportional to 20,885.84, 28,824 and 11,455.28

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Solution

The fourth proportional to 20,885.84, 28,824 and 11,455.28 is: 15,809.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.84 : 28,824 = 11,455.28 : x
  2. Step 2: Convert to fraction form
    20,885.84/28,824 = 11,455.28/x
  3. Step 3: Cross multiply
    20,885.84x = 28,824 × 11,455.28
  4. Step 4: Simplify right side
    20,885.84x = 330,186,990.72
  5. Step 5: Solve for x
    x = 330,186,990.72/20,885.84
  6. Step 6: Final answer
    x = 15,809.13

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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.