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Finding the Fourth Proportional to 21,699.99, 29,946.18 and 12,140.07

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Solution

The fourth proportional to 21,699.99, 29,946.18 and 12,140.07 is: 16,753.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.99 : 29,946.18 = 12,140.07 : x
  2. Step 2: Convert to fraction form
    21,699.99/29,946.18 = 12,140.07/x
  3. Step 3: Cross multiply
    21,699.99x = 29,946.18 × 12,140.07
  4. Step 4: Simplify right side
    21,699.99x = 363,548,721.43
  5. Step 5: Solve for x
    x = 363,548,721.43/21,699.99
  6. Step 6: Final answer
    x = 16,753.41

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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.