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Finding the Fourth Proportional to 640,903.60, 961,441.80 and 220,308.40

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Solution

The fourth proportional to 640,903.60, 961,441.80 and 220,308.40 is: 330,492.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,903.60 : 961,441.80 = 220,308.40 : x
  2. Step 2: Convert to fraction form
    640,903.60/961,441.80 = 220,308.40/x
  3. Step 3: Cross multiply
    640,903.60x = 961,441.80 × 220,308.40
  4. Step 4: Simplify right side
    640,903.60x = 211,813,704,651.12
  5. Step 5: Solve for x
    x = 211,813,704,651.12/640,903.60
  6. Step 6: Final answer
    x = 330,492.30

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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.