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Finding the Fourth Proportional to 205,404.60, 308,106.90 and 139,049.40

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Solution

The fourth proportional to 205,404.60, 308,106.90 and 139,049.40 is: 208,574.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,404.60 : 308,106.90 = 139,049.40 : x
  2. Step 2: Convert to fraction form
    205,404.60/308,106.90 = 139,049.40/x
  3. Step 3: Cross multiply
    205,404.60x = 308,106.90 × 139,049.40
  4. Step 4: Simplify right side
    205,404.60x = 42,842,079,580.86
  5. Step 5: Solve for x
    x = 42,842,079,580.86/205,404.60
  6. Step 6: Final answer
    x = 208,574.10

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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.