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Finding the Fourth Proportional to 543,420.40, 815,130.60 and 419,004.40

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Solution

The fourth proportional to 543,420.40, 815,130.60 and 419,004.40 is: 628,506.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,420.40 : 815,130.60 = 419,004.40 : x
  2. Step 2: Convert to fraction form
    543,420.40/815,130.60 = 419,004.40/x
  3. Step 3: Cross multiply
    543,420.40x = 815,130.60 × 419,004.40
  4. Step 4: Simplify right side
    543,420.40x = 341,543,307,974.64
  5. Step 5: Solve for x
    x = 341,543,307,974.64/543,420.40
  6. Step 6: Final answer
    x = 628,506.60

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Double scale
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Similar ratio
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1.5x scale

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.