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Finding the Fourth Proportional to 621,638.83, 857,860.32 and 349,706.91

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Solution

The fourth proportional to 621,638.83, 857,860.32 and 349,706.91 is: 482,594.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,638.83 : 857,860.32 = 349,706.91 : x
  2. Step 2: Convert to fraction form
    621,638.83/857,860.32 = 349,706.91/x
  3. Step 3: Cross multiply
    621,638.83x = 857,860.32 × 349,706.91
  4. Step 4: Simplify right side
    621,638.83x = 299,999,681,718.81
  5. Step 5: Solve for x
    x = 299,999,681,718.81/621,638.83
  6. Step 6: Final answer
    x = 482,594.82

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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.