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Finding the Fourth Proportional to 70,480.50, 105,721.10 and 17,890

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Solution

The fourth proportional to 70,480.50, 105,721.10 and 17,890 is: 26,835.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,480.50 : 105,721.10 = 17,890 : x
  2. Step 2: Convert to fraction form
    70,480.50/105,721.10 = 17,890/x
  3. Step 3: Cross multiply
    70,480.50x = 105,721.10 × 17,890
  4. Step 4: Simplify right side
    70,480.50x = 1,891,350,479
  5. Step 5: Solve for x
    x = 1,891,350,479/70,480.50
  6. Step 6: Final answer
    x = 26,835.09

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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.