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Finding the Fourth Proportional to 390,578.31, 585,979.79 and 124,379.91

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Solution

The fourth proportional to 390,578.31, 585,979.79 and 124,379.91 is: 186,605.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,578.31 : 585,979.79 = 124,379.91 : x
  2. Step 2: Convert to fraction form
    390,578.31/585,979.79 = 124,379.91/x
  3. Step 3: Cross multiply
    390,578.31x = 585,979.79 × 124,379.91
  4. Step 4: Simplify right side
    390,578.31x = 72,884,112,920.12
  5. Step 5: Solve for x
    x = 72,884,112,920.12/390,578.31
  6. Step 6: Final answer
    x = 186,605.63

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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.