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Finding the Fourth Proportional to 28,957.50, 39,961.35 and 15,709.50

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Solution

The fourth proportional to 28,957.50, 39,961.35 and 15,709.50 is: 21,679.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,957.50 : 39,961.35 = 15,709.50 : x
  2. Step 2: Convert to fraction form
    28,957.50/39,961.35 = 15,709.50/x
  3. Step 3: Cross multiply
    28,957.50x = 39,961.35 × 15,709.50
  4. Step 4: Simplify right side
    28,957.50x = 627,772,827.83
  5. Step 5: Solve for x
    x = 627,772,827.83/28,957.50
  6. Step 6: Final answer
    x = 21,679.11

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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.