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Finding the Fourth Proportional to 640,857.40, 960,249.30 and 403,775.80

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Solution

The fourth proportional to 640,857.40, 960,249.30 and 403,775.80 is: 605,010.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,857.40 : 960,249.30 = 403,775.80 : x
  2. Step 2: Convert to fraction form
    640,857.40/960,249.30 = 403,775.80/x
  3. Step 3: Cross multiply
    640,857.40x = 960,249.30 × 403,775.80
  4. Step 4: Simplify right side
    640,857.40x = 387,725,429,306.94
  5. Step 5: Solve for x
    x = 387,725,429,306.94/640,857.40
  6. Step 6: Final answer
    x = 605,010.46

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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.