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Finding the Fourth Proportional to 640,939.40, 961,409.10 and 539,462.60

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Solution

The fourth proportional to 640,939.40, 961,409.10 and 539,462.60 is: 809,193.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,939.40 : 961,409.10 = 539,462.60 : x
  2. Step 2: Convert to fraction form
    640,939.40/961,409.10 = 539,462.60/x
  3. Step 3: Cross multiply
    640,939.40x = 961,409.10 × 539,462.60
  4. Step 4: Simplify right side
    640,939.40x = 518,644,252,749.66
  5. Step 5: Solve for x
    x = 518,644,252,749.66/640,939.40
  6. Step 6: Final answer
    x = 809,193.90

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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.