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Finding the Fourth Proportional to 659,139.06, 909,619.06 and 387,218.42

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Solution

The fourth proportional to 659,139.06, 909,619.06 and 387,218.42 is: 534,365.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,139.06 : 909,619.06 = 387,218.42 : x
  2. Step 2: Convert to fraction form
    659,139.06/909,619.06 = 387,218.42/x
  3. Step 3: Cross multiply
    659,139.06x = 909,619.06 × 387,218.42
  4. Step 4: Simplify right side
    659,139.06x = 352,221,255,215.09
  5. Step 5: Solve for x
    x = 352,221,255,215.09/659,139.06
  6. Step 6: Final answer
    x = 534,365.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.