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Finding the Fourth Proportional to 408,005.10, 612,007.65 and 347,643.90

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Solution

The fourth proportional to 408,005.10, 612,007.65 and 347,643.90 is: 521,465.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,005.10 : 612,007.65 = 347,643.90 : x
  2. Step 2: Convert to fraction form
    408,005.10/612,007.65 = 347,643.90/x
  3. Step 3: Cross multiply
    408,005.10x = 612,007.65 × 347,643.90
  4. Step 4: Simplify right side
    408,005.10x = 212,760,726,275.84
  5. Step 5: Solve for x
    x = 212,760,726,275.84/408,005.10
  6. Step 6: Final answer
    x = 521,465.85

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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.