Home / 390,500.18-585,081.61-213,131.64

Finding the Fourth Proportional to 390,500.18, 585,081.61 and 213,131.64

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Solution

The fourth proportional to 390,500.18, 585,081.61 and 213,131.64 is: 319,332.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,500.18 : 585,081.61 = 213,131.64 : x
  2. Step 2: Convert to fraction form
    390,500.18/585,081.61 = 213,131.64/x
  3. Step 3: Cross multiply
    390,500.18x = 585,081.61 × 213,131.64
  4. Step 4: Simplify right side
    390,500.18x = 124,699,403,073.14
  5. Step 5: Solve for x
    x = 124,699,403,073.14/390,500.18
  6. Step 6: Final answer
    x = 319,332.51

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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.