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Finding the Fourth Proportional to 390,337.82, 538,659.18 and 220,568.30

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Solution

The fourth proportional to 390,337.82, 538,659.18 and 220,568.30 is: 304,380.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,337.82 : 538,659.18 = 220,568.30 : x
  2. Step 2: Convert to fraction form
    390,337.82/538,659.18 = 220,568.30/x
  3. Step 3: Cross multiply
    390,337.82x = 538,659.18 × 220,568.30
  4. Step 4: Simplify right side
    390,337.82x = 118,811,139,611.99
  5. Step 5: Solve for x
    x = 118,811,139,611.99/390,337.82
  6. Step 6: Final answer
    x = 304,380.29

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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.