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Finding the Fourth Proportional to 640,420.48, 883,654.68 and 385,785.64

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Solution

The fourth proportional to 640,420.48, 883,654.68 and 385,785.64 is: 532,308.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,420.48 : 883,654.68 = 385,785.64 : x
  2. Step 2: Convert to fraction form
    640,420.48/883,654.68 = 385,785.64/x
  3. Step 3: Cross multiply
    640,420.48x = 883,654.68 × 385,785.64
  4. Step 4: Simplify right side
    640,420.48x = 340,901,286,262.80
  5. Step 5: Solve for x
    x = 340,901,286,262.80/640,420.48
  6. Step 6: Final answer
    x = 532,308.53

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1.5x scale

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.