Home / 643,948.80-965,145.60-328,243.20

Finding the Fourth Proportional to 643,948.80, 965,145.60 and 328,243.20

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Solution

The fourth proportional to 643,948.80, 965,145.60 and 328,243.20 is: 491,968.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,948.80 : 965,145.60 = 328,243.20 : x
  2. Step 2: Convert to fraction form
    643,948.80/965,145.60 = 328,243.20/x
  3. Step 3: Cross multiply
    643,948.80x = 965,145.60 × 328,243.20
  4. Step 4: Simplify right side
    643,948.80x = 316,802,480,209.92
  5. Step 5: Solve for x
    x = 316,802,480,209.92/643,948.80
  6. Step 6: Final answer
    x = 491,968.43

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Double scale
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1.5x scale

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.