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Finding the Fourth Proportional to 18,999.40, 28,455.90 and 11,223.40

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Solution

The fourth proportional to 18,999.40, 28,455.90 and 11,223.40 is: 16,809.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.40 : 28,455.90 = 11,223.40 : x
  2. Step 2: Convert to fraction form
    18,999.40/28,455.90 = 11,223.40/x
  3. Step 3: Cross multiply
    18,999.40x = 28,455.90 × 11,223.40
  4. Step 4: Simplify right side
    18,999.40x = 319,371,948.06
  5. Step 5: Solve for x
    x = 319,371,948.06/18,999.40
  6. Step 6: Final answer
    x = 16,809.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.