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Finding the Fourth Proportional to 21,686.60, 29,903.72 and 14,118.96

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Solution

The fourth proportional to 21,686.60, 29,903.72 and 14,118.96 is: 19,468.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,686.60 : 29,903.72 = 14,118.96 : x
  2. Step 2: Convert to fraction form
    21,686.60/29,903.72 = 14,118.96/x
  3. Step 3: Cross multiply
    21,686.60x = 29,903.72 × 14,118.96
  4. Step 4: Simplify right side
    21,686.60x = 422,209,426.53
  5. Step 5: Solve for x
    x = 422,209,426.53/21,686.60
  6. Step 6: Final answer
    x = 19,468.68

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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.