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Finding the Fourth Proportional to 21,111.60, 29,140.65 and 12,619.98

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Solution

The fourth proportional to 21,111.60, 29,140.65 and 12,619.98 is: 17,419.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.60 : 29,140.65 = 12,619.98 : x
  2. Step 2: Convert to fraction form
    21,111.60/29,140.65 = 12,619.98/x
  3. Step 3: Cross multiply
    21,111.60x = 29,140.65 × 12,619.98
  4. Step 4: Simplify right side
    21,111.60x = 367,754,420.19
  5. Step 5: Solve for x
    x = 367,754,420.19/21,111.60
  6. Step 6: Final answer
    x = 17,419.54

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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.