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Finding the Fourth Proportional to 15,725, 23,587.50 and 4,781

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Solution

The fourth proportional to 15,725, 23,587.50 and 4,781 is: 7,171.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,725 : 23,587.50 = 4,781 : x
  2. Step 2: Convert to fraction form
    15,725/23,587.50 = 4,781/x
  3. Step 3: Cross multiply
    15,725x = 23,587.50 × 4,781
  4. Step 4: Simplify right side
    15,725x = 112,771,837.50
  5. Step 5: Solve for x
    x = 112,771,837.50/15,725
  6. Step 6: Final answer
    x = 7,171.50

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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.