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Finding the Fourth Proportional to 621,643.36, 857,866.50 and 349,711.42

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Solution

The fourth proportional to 621,643.36, 857,866.50 and 349,711.42 is: 482,601.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,643.36 : 857,866.50 = 349,711.42 : x
  2. Step 2: Convert to fraction form
    621,643.36/857,866.50 = 349,711.42/x
  3. Step 3: Cross multiply
    621,643.36x = 857,866.50 × 349,711.42
  4. Step 4: Simplify right side
    621,643.36x = 300,005,711,885.43
  5. Step 5: Solve for x
    x = 300,005,711,885.43/621,643.36
  6. Step 6: Final answer
    x = 482,601.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.