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Finding the Fourth Proportional to 390,619.78, 585,735.81 and 124,345.66

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Solution

The fourth proportional to 390,619.78, 585,735.81 and 124,345.66 is: 186,456.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,619.78 : 585,735.81 = 124,345.66 : x
  2. Step 2: Convert to fraction form
    390,619.78/585,735.81 = 124,345.66/x
  3. Step 3: Cross multiply
    390,619.78x = 585,735.81 × 124,345.66
  4. Step 4: Simplify right side
    390,619.78x = 72,833,705,880.08
  5. Step 5: Solve for x
    x = 72,833,705,880.08/390,619.78
  6. Step 6: Final answer
    x = 186,456.78

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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.