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Finding the Fourth Proportional to 479,239.62, 661,231.80 and 315,878.01

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Solution

The fourth proportional to 479,239.62, 661,231.80 and 315,878.01 is: 435,833.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,239.62 : 661,231.80 = 315,878.01 : x
  2. Step 2: Convert to fraction form
    479,239.62/661,231.80 = 315,878.01/x
  3. Step 3: Cross multiply
    479,239.62x = 661,231.80 × 315,878.01
  4. Step 4: Simplify right side
    479,239.62x = 208,868,585,132.72
  5. Step 5: Solve for x
    x = 208,868,585,132.72/479,239.62
  6. Step 6: Final answer
    x = 435,833.30

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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.