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Finding the Fourth Proportional to 438,339.29, 656,979.86 and 213,362.60

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Solution

The fourth proportional to 438,339.29, 656,979.86 and 213,362.60 is: 319,786.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,339.29 : 656,979.86 = 213,362.60 : x
  2. Step 2: Convert to fraction form
    438,339.29/656,979.86 = 213,362.60/x
  3. Step 3: Cross multiply
    438,339.29x = 656,979.86 × 213,362.60
  4. Step 4: Simplify right side
    438,339.29x = 140,174,928,325.74
  5. Step 5: Solve for x
    x = 140,174,928,325.74/438,339.29
  6. Step 6: Final answer
    x = 319,786.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.