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Finding the Fourth Proportional to 386,086.80, 579,130.20 and 339,430.80

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Solution

The fourth proportional to 386,086.80, 579,130.20 and 339,430.80 is: 509,146.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,086.80 : 579,130.20 = 339,430.80 : x
  2. Step 2: Convert to fraction form
    386,086.80/579,130.20 = 339,430.80/x
  3. Step 3: Cross multiply
    386,086.80x = 579,130.20 × 339,430.80
  4. Step 4: Simplify right side
    386,086.80x = 196,574,627,090.16
  5. Step 5: Solve for x
    x = 196,574,627,090.16/386,086.80
  6. Step 6: Final answer
    x = 509,146.20

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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.