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Finding the Fourth Proportional to 390,500.32, 585,081.80 and 213,131.78

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Solution

The fourth proportional to 390,500.32, 585,081.80 and 213,131.78 is: 319,332.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,500.32 : 585,081.80 = 213,131.78 : x
  2. Step 2: Convert to fraction form
    390,500.32/585,081.80 = 213,131.78/x
  3. Step 3: Cross multiply
    390,500.32x = 585,081.80 × 213,131.78
  4. Step 4: Simplify right side
    390,500.32x = 124,699,525,479.60
  5. Step 5: Solve for x
    x = 124,699,525,479.60/390,500.32
  6. Step 6: Final answer
    x = 319,332.71

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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.