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Finding the Fourth Proportional to 415,808.40, 623,712.60 and 389,564.40

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Solution

The fourth proportional to 415,808.40, 623,712.60 and 389,564.40 is: 584,346.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,808.40 : 623,712.60 = 389,564.40 : x
  2. Step 2: Convert to fraction form
    415,808.40/623,712.60 = 389,564.40/x
  3. Step 3: Cross multiply
    415,808.40x = 623,712.60 × 389,564.40
  4. Step 4: Simplify right side
    415,808.40x = 242,976,224,791.44
  5. Step 5: Solve for x
    x = 242,976,224,791.44/415,808.40
  6. Step 6: Final answer
    x = 584,346.60

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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.