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Finding the Fourth Proportional to 551,109.63, 760,478.80 and 309,336.78

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Solution

The fourth proportional to 551,109.63, 760,478.80 and 309,336.78 is: 426,855.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,109.63 : 760,478.80 = 309,336.78 : x
  2. Step 2: Convert to fraction form
    551,109.63/760,478.80 = 309,336.78/x
  3. Step 3: Cross multiply
    551,109.63x = 760,478.80 × 309,336.78
  4. Step 4: Simplify right side
    551,109.63x = 235,244,063,250.26
  5. Step 5: Solve for x
    x = 235,244,063,250.26/551,109.63
  6. Step 6: Final answer
    x = 426,855.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.