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Finding the Fourth Proportional to 25,485.78, 38,231.68 and 12,328.68

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Solution

The fourth proportional to 25,485.78, 38,231.68 and 12,328.68 is: 18,494.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,485.78 : 38,231.68 = 12,328.68 : x
  2. Step 2: Convert to fraction form
    25,485.78/38,231.68 = 12,328.68/x
  3. Step 3: Cross multiply
    25,485.78x = 38,231.68 × 12,328.68
  4. Step 4: Simplify right side
    25,485.78x = 471,346,148.58
  5. Step 5: Solve for x
    x = 471,346,148.58/25,485.78
  6. Step 6: Final answer
    x = 18,494.48

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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.