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Finding the Fourth Proportional to 639,457.20, 959,704.20 and 618,721.20

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Solution

The fourth proportional to 639,457.20, 959,704.20 and 618,721.20 is: 928,583.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,457.20 : 959,704.20 = 618,721.20 : x
  2. Step 2: Convert to fraction form
    639,457.20/959,704.20 = 618,721.20/x
  3. Step 3: Cross multiply
    639,457.20x = 959,704.20 × 618,721.20
  4. Step 4: Simplify right side
    639,457.20x = 593,789,334,269.04
  5. Step 5: Solve for x
    x = 593,789,334,269.04/639,457.20
  6. Step 6: Final answer
    x = 928,583.39

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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.