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Finding the Fourth Proportional to 387,048.40, 579,260.40 and 339,809.20

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Solution

The fourth proportional to 387,048.40, 579,260.40 and 339,809.20 is: 508,561.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,048.40 : 579,260.40 = 339,809.20 : x
  2. Step 2: Convert to fraction form
    387,048.40/579,260.40 = 339,809.20/x
  3. Step 3: Cross multiply
    387,048.40x = 579,260.40 × 339,809.20
  4. Step 4: Simplify right side
    387,048.40x = 196,838,013,115.68
  5. Step 5: Solve for x
    x = 196,838,013,115.68/387,048.40
  6. Step 6: Final answer
    x = 508,561.75

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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.