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Finding the Fourth Proportional to 28,428.98, 42,648.93 and 8,707.70

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Solution

The fourth proportional to 28,428.98, 42,648.93 and 8,707.70 is: 13,063.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.98 : 42,648.93 = 8,707.70 : x
  2. Step 2: Convert to fraction form
    28,428.98/42,648.93 = 8,707.70/x
  3. Step 3: Cross multiply
    28,428.98x = 42,648.93 × 8,707.70
  4. Step 4: Simplify right side
    28,428.98x = 371,374,194.38
  5. Step 5: Solve for x
    x = 371,374,194.38/28,428.98
  6. Step 6: Final answer
    x = 13,063.23

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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.