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Finding the Fourth Proportional to 30,788.44, 42,488.42 and 18,685.42

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Solution

The fourth proportional to 30,788.44, 42,488.42 and 18,685.42 is: 25,786.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,788.44 : 42,488.42 = 18,685.42 : x
  2. Step 2: Convert to fraction form
    30,788.44/42,488.42 = 18,685.42/x
  3. Step 3: Cross multiply
    30,788.44x = 42,488.42 × 18,685.42
  4. Step 4: Simplify right side
    30,788.44x = 793,913,773.19
  5. Step 5: Solve for x
    x = 793,913,773.19/30,788.44
  6. Step 6: Final answer
    x = 25,786.10

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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.