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Finding the Fourth Proportional to 303,431.20, 455,146.80 and 103,721.65

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Solution

The fourth proportional to 303,431.20, 455,146.80 and 103,721.65 is: 155,582.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,431.20 : 455,146.80 = 103,721.65 : x
  2. Step 2: Convert to fraction form
    303,431.20/455,146.80 = 103,721.65/x
  3. Step 3: Cross multiply
    303,431.20x = 455,146.80 × 103,721.65
  4. Step 4: Simplify right side
    303,431.20x = 47,208,577,088.22
  5. Step 5: Solve for x
    x = 47,208,577,088.22/303,431.20
  6. Step 6: Final answer
    x = 155,582.48

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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.