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Finding the Fourth Proportional to 28,888, 39,865.56 and 15,640

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Solution

The fourth proportional to 28,888, 39,865.56 and 15,640 is: 21,583.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,888 : 39,865.56 = 15,640 : x
  2. Step 2: Convert to fraction form
    28,888/39,865.56 = 15,640/x
  3. Step 3: Cross multiply
    28,888x = 39,865.56 × 15,640
  4. Step 4: Simplify right side
    28,888x = 623,497,358.40
  5. Step 5: Solve for x
    x = 623,497,358.40/28,888
  6. Step 6: Final answer
    x = 21,583.26

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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.