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Finding the Fourth Proportional to 319,996.80, 479,995.20 and 257,788.80

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Solution

The fourth proportional to 319,996.80, 479,995.20 and 257,788.80 is: 386,683.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,996.80 : 479,995.20 = 257,788.80 : x
  2. Step 2: Convert to fraction form
    319,996.80/479,995.20 = 257,788.80/x
  3. Step 3: Cross multiply
    319,996.80x = 479,995.20 × 257,788.80
  4. Step 4: Simplify right side
    319,996.80x = 123,737,386,613.76
  5. Step 5: Solve for x
    x = 123,737,386,613.76/319,996.80
  6. Step 6: Final answer
    x = 386,683.20

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Similar ratio
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1.5x scale

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.