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Finding the Fourth Proportional to 21,316.85, 29,409.54 and 12,359.42

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Solution

The fourth proportional to 21,316.85, 29,409.54 and 12,359.42 is: 17,051.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,316.85 : 29,409.54 = 12,359.42 : x
  2. Step 2: Convert to fraction form
    21,316.85/29,409.54 = 12,359.42/x
  3. Step 3: Cross multiply
    21,316.85x = 29,409.54 × 12,359.42
  4. Step 4: Simplify right side
    21,316.85x = 363,484,856.87
  5. Step 5: Solve for x
    x = 363,484,856.87/21,316.85
  6. Step 6: Final answer
    x = 17,051.53

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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.