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Finding the Fourth Proportional to 386,469.10, 579,703.65 and 342,145.90

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Solution

The fourth proportional to 386,469.10, 579,703.65 and 342,145.90 is: 513,218.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,469.10 : 579,703.65 = 342,145.90 : x
  2. Step 2: Convert to fraction form
    386,469.10/579,703.65 = 342,145.90/x
  3. Step 3: Cross multiply
    386,469.10x = 579,703.65 × 342,145.90
  4. Step 4: Simplify right side
    386,469.10x = 198,343,227,062.54
  5. Step 5: Solve for x
    x = 198,343,227,062.54/386,469.10
  6. Step 6: Final answer
    x = 513,218.85

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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.