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Finding the Fourth Proportional to 219,310.55, 302,486.63 and 138,660.20

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Solution

The fourth proportional to 219,310.55, 302,486.63 and 138,660.20 is: 191,248.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,310.55 : 302,486.63 = 138,660.20 : x
  2. Step 2: Convert to fraction form
    219,310.55/302,486.63 = 138,660.20/x
  3. Step 3: Cross multiply
    219,310.55x = 302,486.63 × 138,660.20
  4. Step 4: Simplify right side
    219,310.55x = 41,942,854,407.39
  5. Step 5: Solve for x
    x = 41,942,854,407.39/219,310.55
  6. Step 6: Final answer
    x = 191,248.69

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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.