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Finding the Fourth Proportional to 391,118.48, 539,698.84 and 219,012.51

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Solution

The fourth proportional to 391,118.48, 539,698.84 and 219,012.51 is: 302,212.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,118.48 : 539,698.84 = 219,012.51 : x
  2. Step 2: Convert to fraction form
    391,118.48/539,698.84 = 219,012.51/x
  3. Step 3: Cross multiply
    391,118.48x = 539,698.84 × 219,012.51
  4. Step 4: Simplify right side
    391,118.48x = 118,200,797,592.49
  5. Step 5: Solve for x
    x = 118,200,797,592.49/391,118.48
  6. Step 6: Final answer
    x = 302,212.25

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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.