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Finding the Fourth Proportional to 640,960.42, 884,636.37 and 386,311.90

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Solution

The fourth proportional to 640,960.42, 884,636.37 and 386,311.90 is: 533,177.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,960.42 : 884,636.37 = 386,311.90 : x
  2. Step 2: Convert to fraction form
    640,960.42/884,636.37 = 386,311.90/x
  3. Step 3: Cross multiply
    640,960.42x = 884,636.37 × 386,311.90
  4. Step 4: Simplify right side
    640,960.42x = 341,745,556,903.80
  5. Step 5: Solve for x
    x = 341,745,556,903.80/640,960.42
  6. Step 6: Final answer
    x = 533,177.32

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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.