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Finding the Fourth Proportional to 640,221.42, 883,503.74 and 353,739.47

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Solution

The fourth proportional to 640,221.42, 883,503.74 and 353,739.47 is: 488,159.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,221.42 : 883,503.74 = 353,739.47 : x
  2. Step 2: Convert to fraction form
    640,221.42/883,503.74 = 353,739.47/x
  3. Step 3: Cross multiply
    640,221.42x = 883,503.74 × 353,739.47
  4. Step 4: Simplify right side
    640,221.42x = 312,530,144,730.62
  5. Step 5: Solve for x
    x = 312,530,144,730.62/640,221.42
  6. Step 6: Final answer
    x = 488,159.46

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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.