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Finding the Fourth Proportional to 318,345.66, 439,016.67 and 209,257.29

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Solution

The fourth proportional to 318,345.66, 439,016.67 and 209,257.29 is: 288,577.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,345.66 : 439,016.67 = 209,257.29 : x
  2. Step 2: Convert to fraction form
    318,345.66/439,016.67 = 209,257.29/x
  3. Step 3: Cross multiply
    318,345.66x = 439,016.67 × 209,257.29
  4. Step 4: Simplify right side
    318,345.66x = 91,867,438,629.02
  5. Step 5: Solve for x
    x = 91,867,438,629.02/318,345.66
  6. Step 6: Final answer
    x = 288,577.64

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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.