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Finding the Fourth Proportional to 936,721, 1,405,081.50 and 345,745

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Solution

The fourth proportional to 936,721, 1,405,081.50 and 345,745 is: 518,617.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    936,721 : 1,405,081.50 = 345,745 : x
  2. Step 2: Convert to fraction form
    936,721/1,405,081.50 = 345,745/x
  3. Step 3: Cross multiply
    936,721x = 1,405,081.50 × 345,745
  4. Step 4: Simplify right side
    936,721x = 485,799,903,217.50
  5. Step 5: Solve for x
    x = 485,799,903,217.50/936,721
  6. Step 6: Final answer
    x = 518,617.50

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1.5x scale

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.