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Finding the Fourth Proportional to 390,789.76, 585,790.80 and 154,040.80

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Solution

The fourth proportional to 390,789.76, 585,790.80 and 154,040.80 is: 230,905.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,789.76 : 585,790.80 = 154,040.80 : x
  2. Step 2: Convert to fraction form
    390,789.76/585,790.80 = 154,040.80/x
  3. Step 3: Cross multiply
    390,789.76x = 585,790.80 × 154,040.80
  4. Step 4: Simplify right side
    390,789.76x = 90,235,683,464.64
  5. Step 5: Solve for x
    x = 90,235,683,464.64/390,789.76
  6. Step 6: Final answer
    x = 230,905.96

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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.