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Finding the Fourth Proportional to 303,685.80, 455,528.70 and 287,356.20

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Solution

The fourth proportional to 303,685.80, 455,528.70 and 287,356.20 is: 431,034.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,685.80 : 455,528.70 = 287,356.20 : x
  2. Step 2: Convert to fraction form
    303,685.80/455,528.70 = 287,356.20/x
  3. Step 3: Cross multiply
    303,685.80x = 455,528.70 × 287,356.20
  4. Step 4: Simplify right side
    303,685.80x = 130,898,996,222.94
  5. Step 5: Solve for x
    x = 130,898,996,222.94/303,685.80
  6. Step 6: Final answer
    x = 431,034.30

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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.