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Finding the Fourth Proportional to 643,925.80, 965,111.10 and 328,220.20

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Solution

The fourth proportional to 643,925.80, 965,111.10 and 328,220.20 is: 491,933.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,925.80 : 965,111.10 = 328,220.20 : x
  2. Step 2: Convert to fraction form
    643,925.80/965,111.10 = 328,220.20/x
  3. Step 3: Cross multiply
    643,925.80x = 965,111.10 × 328,220.20
  4. Step 4: Simplify right side
    643,925.80x = 316,768,958,264.22
  5. Step 5: Solve for x
    x = 316,768,958,264.22/643,925.80
  6. Step 6: Final answer
    x = 491,933.94

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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.