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Finding the Fourth Proportional to 640,915.80, 961,373.70 and 266,890.20

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Solution

The fourth proportional to 640,915.80, 961,373.70 and 266,890.20 is: 400,335.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,915.80 : 961,373.70 = 266,890.20 : x
  2. Step 2: Convert to fraction form
    640,915.80/961,373.70 = 266,890.20/x
  3. Step 3: Cross multiply
    640,915.80x = 961,373.70 × 266,890.20
  4. Step 4: Simplify right side
    640,915.80x = 256,581,219,067.74
  5. Step 5: Solve for x
    x = 256,581,219,067.74/640,915.80
  6. Step 6: Final answer
    x = 400,335.30

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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.