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Finding the Fourth Proportional to 21,309.99, 29,420.40 and 18,945.60

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Solution

The fourth proportional to 21,309.99, 29,420.40 and 18,945.60 is: 26,156.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,309.99 : 29,420.40 = 18,945.60 : x
  2. Step 2: Convert to fraction form
    21,309.99/29,420.40 = 18,945.60/x
  3. Step 3: Cross multiply
    21,309.99x = 29,420.40 × 18,945.60
  4. Step 4: Simplify right side
    21,309.99x = 557,387,130.24
  5. Step 5: Solve for x
    x = 557,387,130.24/21,309.99
  6. Step 6: Final answer
    x = 26,156.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.