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Finding the Fourth Proportional to 640,430.60, 960,611.28 and 324,879.36

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Solution

The fourth proportional to 640,430.60, 960,611.28 and 324,879.36 is: 487,301.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,430.60 : 960,611.28 = 324,879.36 : x
  2. Step 2: Convert to fraction form
    640,430.60/960,611.28 = 324,879.36/x
  3. Step 3: Cross multiply
    640,430.60x = 960,611.28 × 324,879.36
  4. Step 4: Simplify right side
    640,430.60x = 312,082,777,855.18
  5. Step 5: Solve for x
    x = 312,082,777,855.18/640,430.60
  6. Step 6: Final answer
    x = 487,301.48

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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.