Home / 20,981.70-28,953.45-19,309.86

Finding the Fourth Proportional to 20,981.70, 28,953.45 and 19,309.86

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Solution

The fourth proportional to 20,981.70, 28,953.45 and 19,309.86 is: 26,646.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.70 : 28,953.45 = 19,309.86 : x
  2. Step 2: Convert to fraction form
    20,981.70/28,953.45 = 19,309.86/x
  3. Step 3: Cross multiply
    20,981.70x = 28,953.45 × 19,309.86
  4. Step 4: Simplify right side
    20,981.70x = 559,087,066.02
  5. Step 5: Solve for x
    x = 559,087,066.02/20,981.70
  6. Step 6: Final answer
    x = 26,646.41

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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.