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Finding the Fourth Proportional to 640,880.64, 961,310.43 and 261,718.02

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Solution

The fourth proportional to 640,880.64, 961,310.43 and 261,718.02 is: 392,572.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,880.64 : 961,310.43 = 261,718.02 : x
  2. Step 2: Convert to fraction form
    640,880.64/961,310.43 = 261,718.02/x
  3. Step 3: Cross multiply
    640,880.64x = 961,310.43 × 261,718.02
  4. Step 4: Simplify right side
    640,880.64x = 251,592,262,344.95
  5. Step 5: Solve for x
    x = 251,592,262,344.95/640,880.64
  6. Step 6: Final answer
    x = 392,572.73

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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.