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Finding the Fourth Proportional to 639,815.50, 959,720.50 and 260,651.67

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Solution

The fourth proportional to 639,815.50, 959,720.50 and 260,651.67 is: 390,976.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,815.50 : 959,720.50 = 260,651.67 : x
  2. Step 2: Convert to fraction form
    639,815.50/959,720.50 = 260,651.67/x
  3. Step 3: Cross multiply
    639,815.50x = 959,720.50 × 260,651.67
  4. Step 4: Simplify right side
    639,815.50x = 250,152,751,058.24
  5. Step 5: Solve for x
    x = 250,152,751,058.24/639,815.50
  6. Step 6: Final answer
    x = 390,976.38

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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.