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Finding the Fourth Proportional to 640,878.40, 960,280.80 and 403,796.80

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Solution

The fourth proportional to 640,878.40, 960,280.80 and 403,796.80 is: 605,041.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,878.40 : 960,280.80 = 403,796.80 : x
  2. Step 2: Convert to fraction form
    640,878.40/960,280.80 = 403,796.80/x
  3. Step 3: Cross multiply
    640,878.40x = 960,280.80 × 403,796.80
  4. Step 4: Simplify right side
    640,878.40x = 387,758,314,141.44
  5. Step 5: Solve for x
    x = 387,758,314,141.44/640,878.40
  6. Step 6: Final answer
    x = 605,041.95

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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.