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Finding the Fourth Proportional to 640,860.60, 961,377.30 and 220,265.40

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Solution

The fourth proportional to 640,860.60, 961,377.30 and 220,265.40 is: 330,427.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,860.60 : 961,377.30 = 220,265.40 : x
  2. Step 2: Convert to fraction form
    640,860.60/961,377.30 = 220,265.40/x
  3. Step 3: Cross multiply
    640,860.60x = 961,377.30 × 220,265.40
  4. Step 4: Simplify right side
    640,860.60x = 211,758,155,535.42
  5. Step 5: Solve for x
    x = 211,758,155,535.42/640,860.60
  6. Step 6: Final answer
    x = 330,427.80

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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.