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Finding the Fourth Proportional to 321,430.78, 443,544.60 and 178,178.68

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Solution

The fourth proportional to 321,430.78, 443,544.60 and 178,178.68 is: 245,870.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,430.78 : 443,544.60 = 178,178.68 : x
  2. Step 2: Convert to fraction form
    321,430.78/443,544.60 = 178,178.68/x
  3. Step 3: Cross multiply
    321,430.78x = 443,544.60 × 178,178.68
  4. Step 4: Simplify right side
    321,430.78x = 79,030,191,349.13
  5. Step 5: Solve for x
    x = 79,030,191,349.13/321,430.78
  6. Step 6: Final answer
    x = 245,870.02

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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.