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Finding the Fourth Proportional to 528,640.78, 729,504.77 and 286,918.17

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Solution

The fourth proportional to 528,640.78, 729,504.77 and 286,918.17 is: 395,936.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,640.78 : 729,504.77 = 286,918.17 : x
  2. Step 2: Convert to fraction form
    528,640.78/729,504.77 = 286,918.17/x
  3. Step 3: Cross multiply
    528,640.78x = 729,504.77 × 286,918.17
  4. Step 4: Simplify right side
    528,640.78x = 209,308,168,977.64
  5. Step 5: Solve for x
    x = 209,308,168,977.64/528,640.78
  6. Step 6: Final answer
    x = 395,936.48

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.