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Finding the Fourth Proportional to 659,139.56, 909,619.76 and 387,218.92

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Solution

The fourth proportional to 659,139.56, 909,619.76 and 387,218.92 is: 534,366.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,139.56 : 909,619.76 = 387,218.92 : x
  2. Step 2: Convert to fraction form
    659,139.56/909,619.76 = 387,218.92/x
  3. Step 3: Cross multiply
    659,139.56x = 909,619.76 × 387,218.92
  4. Step 4: Simplify right side
    659,139.56x = 352,221,981,077.86
  5. Step 5: Solve for x
    x = 352,221,981,077.86/659,139.56
  6. Step 6: Final answer
    x = 534,366.32

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1.5x scale

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.