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Finding the Fourth Proportional to 393,065.55, 542,427.15 and 220,984.26

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Solution

The fourth proportional to 393,065.55, 542,427.15 and 220,984.26 is: 304,956.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,065.55 : 542,427.15 = 220,984.26 : x
  2. Step 2: Convert to fraction form
    393,065.55/542,427.15 = 220,984.26/x
  3. Step 3: Cross multiply
    393,065.55x = 542,427.15 × 220,984.26
  4. Step 4: Simplify right side
    393,065.55x = 119,867,862,346.66
  5. Step 5: Solve for x
    x = 119,867,862,346.66/393,065.55
  6. Step 6: Final answer
    x = 304,956.42

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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.