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Finding the Fourth Proportional to 390,394.13, 582,309.54 and 354,516.39

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Solution

The fourth proportional to 390,394.13, 582,309.54 and 354,516.39 is: 528,794.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,394.13 : 582,309.54 = 354,516.39 : x
  2. Step 2: Convert to fraction form
    390,394.13/582,309.54 = 354,516.39/x
  3. Step 3: Cross multiply
    390,394.13x = 582,309.54 × 354,516.39
  4. Step 4: Simplify right side
    390,394.13x = 206,438,275,983.36
  5. Step 5: Solve for x
    x = 206,438,275,983.36/390,394.13
  6. Step 6: Final answer
    x = 528,794.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.