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Finding the Fourth Proportional to 415,864.40, 623,796.60 and 389,620.40

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Solution

The fourth proportional to 415,864.40, 623,796.60 and 389,620.40 is: 584,430.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,864.40 : 623,796.60 = 389,620.40 : x
  2. Step 2: Convert to fraction form
    415,864.40/623,796.60 = 389,620.40/x
  3. Step 3: Cross multiply
    415,864.40x = 623,796.60 × 389,620.40
  4. Step 4: Simplify right side
    415,864.40x = 243,043,880,810.64
  5. Step 5: Solve for x
    x = 243,043,880,810.64/415,864.40
  6. Step 6: Final answer
    x = 584,430.60

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.