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Finding the Fourth Proportional to 18,690.79, 28,036.19 and 12,829.63

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Solution

The fourth proportional to 18,690.79, 28,036.19 and 12,829.63 is: 19,244.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.79 : 28,036.19 = 12,829.63 : x
  2. Step 2: Convert to fraction form
    18,690.79/28,036.19 = 12,829.63/x
  3. Step 3: Cross multiply
    18,690.79x = 28,036.19 × 12,829.63
  4. Step 4: Simplify right side
    18,690.79x = 359,693,944.31
  5. Step 5: Solve for x
    x = 359,693,944.31/18,690.79
  6. Step 6: Final answer
    x = 19,244.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.