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Finding the Fourth Proportional to 640,840.40, 960,223.80 and 403,758.80

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Solution

The fourth proportional to 640,840.40, 960,223.80 and 403,758.80 is: 604,984.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,840.40 : 960,223.80 = 403,758.80 : x
  2. Step 2: Convert to fraction form
    640,840.40/960,223.80 = 403,758.80/x
  3. Step 3: Cross multiply
    640,840.40x = 960,223.80 × 403,758.80
  4. Step 4: Simplify right side
    640,840.40x = 387,698,809,219.44
  5. Step 5: Solve for x
    x = 387,698,809,219.44/640,840.40
  6. Step 6: Final answer
    x = 604,984.97

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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.