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Finding the Fourth Proportional to 28,423.89, 39,209.22 and 19,938.65

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Solution

The fourth proportional to 28,423.89, 39,209.22 and 19,938.65 is: 27,504.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,423.89 : 39,209.22 = 19,938.65 : x
  2. Step 2: Convert to fraction form
    28,423.89/39,209.22 = 19,938.65/x
  3. Step 3: Cross multiply
    28,423.89x = 39,209.22 × 19,938.65
  4. Step 4: Simplify right side
    28,423.89x = 781,778,718.31
  5. Step 5: Solve for x
    x = 781,778,718.31/28,423.89
  6. Step 6: Final answer
    x = 27,504.28

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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.