Home / 20,876.40-28,792.56-12,913.04

Finding the Fourth Proportional to 20,876.40, 28,792.56 and 12,913.04

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Solution

The fourth proportional to 20,876.40, 28,792.56 and 12,913.04 is: 17,809.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.40 : 28,792.56 = 12,913.04 : x
  2. Step 2: Convert to fraction form
    20,876.40/28,792.56 = 12,913.04/x
  3. Step 3: Cross multiply
    20,876.40x = 28,792.56 × 12,913.04
  4. Step 4: Simplify right side
    20,876.40x = 371,799,478.98
  5. Step 5: Solve for x
    x = 371,799,478.98/20,876.40
  6. Step 6: Final answer
    x = 17,809.56

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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.