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Finding the Fourth Proportional to 640,802.60, 961,290.30 and 220,207.40

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Solution

The fourth proportional to 640,802.60, 961,290.30 and 220,207.40 is: 330,340.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,802.60 : 961,290.30 = 220,207.40 : x
  2. Step 2: Convert to fraction form
    640,802.60/961,290.30 = 220,207.40/x
  3. Step 3: Cross multiply
    640,802.60x = 961,290.30 × 220,207.40
  4. Step 4: Simplify right side
    640,802.60x = 211,683,237,608.22
  5. Step 5: Solve for x
    x = 211,683,237,608.22/640,802.60
  6. Step 6: Final answer
    x = 330,340.79

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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.