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Finding the Fourth Proportional to 21,363.89, 31,800.36 and 21,047.99

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Solution

The fourth proportional to 21,363.89, 31,800.36 and 21,047.99 is: 31,330.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,363.89 : 31,800.36 = 21,047.99 : x
  2. Step 2: Convert to fraction form
    21,363.89/31,800.36 = 21,047.99/x
  3. Step 3: Cross multiply
    21,363.89x = 31,800.36 × 21,047.99
  4. Step 4: Simplify right side
    21,363.89x = 669,333,579.20
  5. Step 5: Solve for x
    x = 669,333,579.20/21,363.89
  6. Step 6: Final answer
    x = 31,330.14

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.