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Finding the Fourth Proportional to 390,884.32, 539,446.44 and 218,817.55

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Solution

The fourth proportional to 390,884.32, 539,446.44 and 218,817.55 is: 301,982.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,884.32 : 539,446.44 = 218,817.55 : x
  2. Step 2: Convert to fraction form
    390,884.32/539,446.44 = 218,817.55/x
  3. Step 3: Cross multiply
    390,884.32x = 539,446.44 × 218,817.55
  4. Step 4: Simplify right side
    390,884.32x = 118,040,348,357.02
  5. Step 5: Solve for x
    x = 118,040,348,357.02/390,884.32
  6. Step 6: Final answer
    x = 301,982.82

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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.