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Finding the Fourth Proportional to 387,030.40, 579,233.40 and 339,791.20

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Solution

The fourth proportional to 387,030.40, 579,233.40 and 339,791.20 is: 508,534.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,030.40 : 579,233.40 = 339,791.20 : x
  2. Step 2: Convert to fraction form
    387,030.40/579,233.40 = 339,791.20/x
  3. Step 3: Cross multiply
    387,030.40x = 579,233.40 × 339,791.20
  4. Step 4: Simplify right side
    387,030.40x = 196,818,412,066.08
  5. Step 5: Solve for x
    x = 196,818,412,066.08/387,030.40
  6. Step 6: Final answer
    x = 508,534.76

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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.