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Finding the Fourth Proportional to 398,640,658.60, 597,960,987.90 and 217,242,130.60

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Solution

The fourth proportional to 398,640,658.60, 597,960,987.90 and 217,242,130.60 is: 325,863,195.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,640,658.60 : 597,960,987.90 = 217,242,130.60 : x
  2. Step 2: Convert to fraction form
    398,640,658.60/597,960,987.90 = 217,242,130.60/x
  3. Step 3: Cross multiply
    398,640,658.60x = 597,960,987.90 × 217,242,130.60
  4. Step 4: Simplify right side
    398,640,658.60x = 129,902,319,027,076,816
  5. Step 5: Solve for x
    x = 129,902,319,027,076,816/398,640,658.60
  6. Step 6: Final answer
    x = 325,863,195.90

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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.