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Finding the Fourth Proportional to 640,221.55, 883,503.91 and 353,739.58

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Solution

The fourth proportional to 640,221.55, 883,503.91 and 353,739.58 is: 488,159.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,221.55 : 883,503.91 = 353,739.58 : x
  2. Step 2: Convert to fraction form
    640,221.55/883,503.91 = 353,739.58/x
  3. Step 3: Cross multiply
    640,221.55x = 883,503.91 × 353,739.58
  4. Step 4: Simplify right side
    640,221.55x = 312,530,302,051.76
  5. Step 5: Solve for x
    x = 312,530,302,051.76/640,221.55
  6. Step 6: Final answer
    x = 488,159.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.