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Finding the Fourth Proportional to 20,495.99, 28,284.89 and 12,429.90

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Solution

The fourth proportional to 20,495.99, 28,284.89 and 12,429.90 is: 17,153.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,495.99 : 28,284.89 = 12,429.90 : x
  2. Step 2: Convert to fraction form
    20,495.99/28,284.89 = 12,429.90/x
  3. Step 3: Cross multiply
    20,495.99x = 28,284.89 × 12,429.90
  4. Step 4: Simplify right side
    20,495.99x = 351,578,292.06
  5. Step 5: Solve for x
    x = 351,578,292.06/20,495.99
  6. Step 6: Final answer
    x = 17,153.52

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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.