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Finding the Fourth Proportional to 28,957.76, 43,397.76 and 15,790.40

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Solution

The fourth proportional to 28,957.76, 43,397.76 and 15,790.40 is: 23,664.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,957.76 : 43,397.76 = 15,790.40 : x
  2. Step 2: Convert to fraction form
    28,957.76/43,397.76 = 15,790.40/x
  3. Step 3: Cross multiply
    28,957.76x = 43,397.76 × 15,790.40
  4. Step 4: Simplify right side
    28,957.76x = 685,267,989.50
  5. Step 5: Solve for x
    x = 685,267,989.50/28,957.76
  6. Step 6: Final answer
    x = 23,664.40

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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.