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Finding the Fourth Proportional to 28,966, 39,973.08 and 15,718

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Solution

The fourth proportional to 28,966, 39,973.08 and 15,718 is: 21,690.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,966 : 39,973.08 = 15,718 : x
  2. Step 2: Convert to fraction form
    28,966/39,973.08 = 15,718/x
  3. Step 3: Cross multiply
    28,966x = 39,973.08 × 15,718
  4. Step 4: Simplify right side
    28,966x = 628,296,871.44
  5. Step 5: Solve for x
    x = 628,296,871.44/28,966
  6. Step 6: Final answer
    x = 21,690.84

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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.