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Finding the Fourth Proportional to 208,146.40, 312,219.60 and 103,039.20

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Solution

The fourth proportional to 208,146.40, 312,219.60 and 103,039.20 is: 154,558.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,146.40 : 312,219.60 = 103,039.20 : x
  2. Step 2: Convert to fraction form
    208,146.40/312,219.60 = 103,039.20/x
  3. Step 3: Cross multiply
    208,146.40x = 312,219.60 × 103,039.20
  4. Step 4: Simplify right side
    208,146.40x = 32,170,857,808.32
  5. Step 5: Solve for x
    x = 32,170,857,808.32/208,146.40
  6. Step 6: Final answer
    x = 154,558.80

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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.