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Finding the Fourth Proportional to 208,001.60, 312,002.40 and 128,859.20

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Solution

The fourth proportional to 208,001.60, 312,002.40 and 128,859.20 is: 193,288.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,001.60 : 312,002.40 = 128,859.20 : x
  2. Step 2: Convert to fraction form
    208,001.60/312,002.40 = 128,859.20/x
  3. Step 3: Cross multiply
    208,001.60x = 312,002.40 × 128,859.20
  4. Step 4: Simplify right side
    208,001.60x = 40,204,379,662.08
  5. Step 5: Solve for x
    x = 40,204,379,662.08/208,001.60
  6. Step 6: Final answer
    x = 193,288.80

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1.5x scale

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.