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Finding the Fourth Proportional to 387,780.30, 535,136.79 and 218,014.43

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Solution

The fourth proportional to 387,780.30, 535,136.79 and 218,014.43 is: 300,859.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,780.30 : 535,136.79 = 218,014.43 : x
  2. Step 2: Convert to fraction form
    387,780.30/535,136.79 = 218,014.43/x
  3. Step 3: Cross multiply
    387,780.30x = 535,136.79 × 218,014.43
  4. Step 4: Simplify right side
    387,780.30x = 116,667,539,568.20
  5. Step 5: Solve for x
    x = 116,667,539,568.20/387,780.30
  6. Step 6: Final answer
    x = 300,859.89

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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.