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Finding the Fourth Proportional to 38,990.61, 58,485.87 and 12,695.31

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Solution

The fourth proportional to 38,990.61, 58,485.87 and 12,695.31 is: 19,042.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,990.61 : 58,485.87 = 12,695.31 : x
  2. Step 2: Convert to fraction form
    38,990.61/58,485.87 = 12,695.31/x
  3. Step 3: Cross multiply
    38,990.61x = 58,485.87 × 12,695.31
  4. Step 4: Simplify right side
    38,990.61x = 742,496,250.27
  5. Step 5: Solve for x
    x = 742,496,250.27/38,990.61
  6. Step 6: Final answer
    x = 19,042.95

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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.