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Finding the Fourth Proportional to 390,906.61, 539,507.59 and 225,302.41

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Solution

The fourth proportional to 390,906.61, 539,507.59 and 225,302.41 is: 310,949.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,906.61 : 539,507.59 = 225,302.41 : x
  2. Step 2: Convert to fraction form
    390,906.61/539,507.59 = 225,302.41/x
  3. Step 3: Cross multiply
    390,906.61x = 539,507.59 × 225,302.41
  4. Step 4: Simplify right side
    390,906.61x = 121,552,360,351.42
  5. Step 5: Solve for x
    x = 121,552,360,351.42/390,906.61
  6. Step 6: Final answer
    x = 310,949.87

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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.