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Finding the Fourth Proportional to 418,399.65, 577,669.57 and 321,430.79

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Solution

The fourth proportional to 418,399.65, 577,669.57 and 321,430.79 is: 443,788.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,399.65 : 577,669.57 = 321,430.79 : x
  2. Step 2: Convert to fraction form
    418,399.65/577,669.57 = 321,430.79/x
  3. Step 3: Cross multiply
    418,399.65x = 577,669.57 × 321,430.79
  4. Step 4: Simplify right side
    418,399.65x = 185,680,786,884.66
  5. Step 5: Solve for x
    x = 185,680,786,884.66/418,399.65
  6. Step 6: Final answer
    x = 443,788.10

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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.