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Finding the Fourth Proportional to 390,250.37, 585,109.19 and 207,908.43

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Solution

The fourth proportional to 390,250.37, 585,109.19 and 207,908.43 is: 311,720.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,250.37 : 585,109.19 = 207,908.43 : x
  2. Step 2: Convert to fraction form
    390,250.37/585,109.19 = 207,908.43/x
  3. Step 3: Cross multiply
    390,250.37x = 585,109.19 × 207,908.43
  4. Step 4: Simplify right side
    390,250.37x = 121,649,132,031.93
  5. Step 5: Solve for x
    x = 121,649,132,031.93/390,250.37
  6. Step 6: Final answer
    x = 311,720.74

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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.