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Finding the Fourth Proportional to 390,245.56, 585,243.76 and 123,943.79

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Solution

The fourth proportional to 390,245.56, 585,243.76 and 123,943.79 is: 185,876.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,245.56 : 585,243.76 = 123,943.79 : x
  2. Step 2: Convert to fraction form
    390,245.56/585,243.76 = 123,943.79/x
  3. Step 3: Cross multiply
    390,245.56x = 585,243.76 × 123,943.79
  4. Step 4: Simplify right side
    390,245.56x = 72,537,329,688.25
  5. Step 5: Solve for x
    x = 72,537,329,688.25/390,245.56
  6. Step 6: Final answer
    x = 185,876.12

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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.