Home / 20,931.45-28,880.85-11,981.76

Finding the Fourth Proportional to 20,931.45, 28,880.85 and 11,981.76

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Solution

The fourth proportional to 20,931.45, 28,880.85 and 11,981.76 is: 16,532.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.45 : 28,880.85 = 11,981.76 : x
  2. Step 2: Convert to fraction form
    20,931.45/28,880.85 = 11,981.76/x
  3. Step 3: Cross multiply
    20,931.45x = 28,880.85 × 11,981.76
  4. Step 4: Simplify right side
    20,931.45x = 346,043,413.30
  5. Step 5: Solve for x
    x = 346,043,413.30/20,931.45
  6. Step 6: Final answer
    x = 16,532.22

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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.