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Finding the Fourth Proportional to 543,621.20, 815,431.80 and 342,854.60

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Solution

The fourth proportional to 543,621.20, 815,431.80 and 342,854.60 is: 514,281.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,621.20 : 815,431.80 = 342,854.60 : x
  2. Step 2: Convert to fraction form
    543,621.20/815,431.80 = 342,854.60/x
  3. Step 3: Cross multiply
    543,621.20x = 815,431.80 × 342,854.60
  4. Step 4: Simplify right side
    543,621.20x = 279,574,543,616.28
  5. Step 5: Solve for x
    x = 279,574,543,616.28/543,621.20
  6. Step 6: Final answer
    x = 514,281.90

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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.