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Finding the Fourth Proportional to 20,958.63, 28,934.87 and 13,894.62

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Solution

The fourth proportional to 20,958.63, 28,934.87 and 13,894.62 is: 19,182.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,958.63 : 28,934.87 = 13,894.62 : x
  2. Step 2: Convert to fraction form
    20,958.63/28,934.87 = 13,894.62/x
  3. Step 3: Cross multiply
    20,958.63x = 28,934.87 × 13,894.62
  4. Step 4: Simplify right side
    20,958.63x = 402,038,953.93
  5. Step 5: Solve for x
    x = 402,038,953.93/20,958.63
  6. Step 6: Final answer
    x = 19,182.50

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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.