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Finding the Fourth Proportional to 660,401.20, 991,638.60 and 380,465.20

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Solution

The fourth proportional to 660,401.20, 991,638.60 and 380,465.20 is: 571,295.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,401.20 : 991,638.60 = 380,465.20 : x
  2. Step 2: Convert to fraction form
    660,401.20/991,638.60 = 380,465.20/x
  3. Step 3: Cross multiply
    660,401.20x = 991,638.60 × 380,465.20
  4. Step 4: Simplify right side
    660,401.20x = 377,283,978,276.72
  5. Step 5: Solve for x
    x = 377,283,978,276.72/660,401.20
  6. Step 6: Final answer
    x = 571,295.11

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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.