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Finding the Fourth Proportional to 21,695.18, 29,930.51 and 14,138.75

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Solution

The fourth proportional to 21,695.18, 29,930.51 and 14,138.75 is: 19,505.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,695.18 : 29,930.51 = 14,138.75 : x
  2. Step 2: Convert to fraction form
    21,695.18/29,930.51 = 14,138.75/x
  3. Step 3: Cross multiply
    21,695.18x = 29,930.51 × 14,138.75
  4. Step 4: Simplify right side
    21,695.18x = 423,180,002.40
  5. Step 5: Solve for x
    x = 423,180,002.40/21,695.18
  6. Step 6: Final answer
    x = 19,505.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.