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Finding the Fourth Proportional to 38,992.64, 58,496.85 and 12,690.32

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Solution

The fourth proportional to 38,992.64, 58,496.85 and 12,690.32 is: 19,038.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,992.64 : 58,496.85 = 12,690.32 : x
  2. Step 2: Convert to fraction form
    38,992.64/58,496.85 = 12,690.32/x
  3. Step 3: Cross multiply
    38,992.64x = 58,496.85 × 12,690.32
  4. Step 4: Simplify right side
    38,992.64x = 742,343,453.01
  5. Step 5: Solve for x
    x = 742,343,453.01/38,992.64
  6. Step 6: Final answer
    x = 19,038.04

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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.