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Finding the Fourth Proportional to 21,689.79, 29,931.70 and 12,129.57

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Solution

The fourth proportional to 21,689.79, 29,931.70 and 12,129.57 is: 16,738.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.79 : 29,931.70 = 12,129.57 : x
  2. Step 2: Convert to fraction form
    21,689.79/29,931.70 = 12,129.57/x
  3. Step 3: Cross multiply
    21,689.79x = 29,931.70 × 12,129.57
  4. Step 4: Simplify right side
    21,689.79x = 363,058,665.53
  5. Step 5: Solve for x
    x = 363,058,665.53/21,689.79
  6. Step 6: Final answer
    x = 16,738.69

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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.