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Finding the Fourth Proportional to 443,913.48, 665,969.76 and 128,394.90

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Solution

The fourth proportional to 443,913.48, 665,969.76 and 128,394.90 is: 192,621.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,913.48 : 665,969.76 = 128,394.90 : x
  2. Step 2: Convert to fraction form
    443,913.48/665,969.76 = 128,394.90/x
  3. Step 3: Cross multiply
    443,913.48x = 665,969.76 × 128,394.90
  4. Step 4: Simplify right side
    443,913.48x = 85,507,120,738.22
  5. Step 5: Solve for x
    x = 85,507,120,738.22/443,913.48
  6. Step 6: Final answer
    x = 192,621.14

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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.