Home / 20,880.51-28,811.04-12,381.06

Finding the Fourth Proportional to 20,880.51, 28,811.04 and 12,381.06

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Solution

The fourth proportional to 20,880.51, 28,811.04 and 12,381.06 is: 17,083.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.51 : 28,811.04 = 12,381.06 : x
  2. Step 2: Convert to fraction form
    20,880.51/28,811.04 = 12,381.06/x
  3. Step 3: Cross multiply
    20,880.51x = 28,811.04 × 12,381.06
  4. Step 4: Simplify right side
    20,880.51x = 356,711,214.90
  5. Step 5: Solve for x
    x = 356,711,214.90/20,880.51
  6. Step 6: Final answer
    x = 17,083.45

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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.