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Finding the Fourth Proportional to 390,134.50, 538,429.44 and 220,379.56

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Solution

The fourth proportional to 390,134.50, 538,429.44 and 220,379.56 is: 304,148.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,134.50 : 538,429.44 = 220,379.56 : x
  2. Step 2: Convert to fraction form
    390,134.50/538,429.44 = 220,379.56/x
  3. Step 3: Cross multiply
    390,134.50x = 538,429.44 × 220,379.56
  4. Step 4: Simplify right side
    390,134.50x = 118,658,843,078.25
  5. Step 5: Solve for x
    x = 118,658,843,078.25/390,134.50
  6. Step 6: Final answer
    x = 304,148.55

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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.