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Finding the Fourth Proportional to 408,053.10, 612,079.65 and 405,428.70

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Solution

The fourth proportional to 408,053.10, 612,079.65 and 405,428.70 is: 608,143.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,053.10 : 612,079.65 = 405,428.70 : x
  2. Step 2: Convert to fraction form
    408,053.10/612,079.65 = 405,428.70/x
  3. Step 3: Cross multiply
    408,053.10x = 612,079.65 × 405,428.70
  4. Step 4: Simplify right side
    408,053.10x = 248,154,656,795.96
  5. Step 5: Solve for x
    x = 248,154,656,795.96/408,053.10
  6. Step 6: Final answer
    x = 608,143.05

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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.