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Finding the Fourth Proportional to 431,479.20, 646,988.40 and 181,879.20

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Solution

The fourth proportional to 431,479.20, 646,988.40 and 181,879.20 is: 272,721.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,479.20 : 646,988.40 = 181,879.20 : x
  2. Step 2: Convert to fraction form
    431,479.20/646,988.40 = 181,879.20/x
  3. Step 3: Cross multiply
    431,479.20x = 646,988.40 × 181,879.20
  4. Step 4: Simplify right side
    431,479.20x = 117,673,732,601.28
  5. Step 5: Solve for x
    x = 117,673,732,601.28/431,479.20
  6. Step 6: Final answer
    x = 272,721.68

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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.