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Finding the Fourth Proportional to 28,770, 39,702.60 and 19,943.12

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Solution

The fourth proportional to 28,770, 39,702.60 and 19,943.12 is: 27,521.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,770 : 39,702.60 = 19,943.12 : x
  2. Step 2: Convert to fraction form
    28,770/39,702.60 = 19,943.12/x
  3. Step 3: Cross multiply
    28,770x = 39,702.60 × 19,943.12
  4. Step 4: Simplify right side
    28,770x = 791,793,716.11
  5. Step 5: Solve for x
    x = 791,793,716.11/28,770
  6. Step 6: Final answer
    x = 27,521.51

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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.