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Finding the Fourth Proportional to 390,997.62, 539,530.56 and 225,423.72

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Solution

The fourth proportional to 390,997.62, 539,530.56 and 225,423.72 is: 311,058.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,997.62 : 539,530.56 = 225,423.72 : x
  2. Step 2: Convert to fraction form
    390,997.62/539,530.56 = 225,423.72/x
  3. Step 3: Cross multiply
    390,997.62x = 539,530.56 × 225,423.72
  4. Step 4: Simplify right side
    390,997.62x = 121,622,985,888.88
  5. Step 5: Solve for x
    x = 121,622,985,888.88/390,997.62
  6. Step 6: Final answer
    x = 311,058.12

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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.