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Finding the Fourth Proportional to 38,656.36, 57,978.78 and 12,358.36

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Solution

The fourth proportional to 38,656.36, 57,978.78 and 12,358.36 is: 18,535.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,656.36 : 57,978.78 = 12,358.36 : x
  2. Step 2: Convert to fraction form
    38,656.36/57,978.78 = 12,358.36/x
  3. Step 3: Cross multiply
    38,656.36x = 57,978.78 × 12,358.36
  4. Step 4: Simplify right side
    38,656.36x = 716,522,635.60
  5. Step 5: Solve for x
    x = 716,522,635.60/38,656.36
  6. Step 6: Final answer
    x = 18,535.70

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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.