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Finding the Fourth Proportional to 391,121.22, 539,702.64 and 219,015.24

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Solution

The fourth proportional to 391,121.22, 539,702.64 and 219,015.24 is: 302,216.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,121.22 : 539,702.64 = 219,015.24 : x
  2. Step 2: Convert to fraction form
    391,121.22/539,702.64 = 219,015.24/x
  3. Step 3: Cross multiply
    391,121.22x = 539,702.64 × 219,015.24
  4. Step 4: Simplify right side
    391,121.22x = 118,203,103,228.23
  5. Step 5: Solve for x
    x = 118,203,103,228.23/391,121.22
  6. Step 6: Final answer
    x = 302,216.03

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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.