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Finding the Fourth Proportional to 611,873.40, 917,810.10 and 521,331.60

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Solution

The fourth proportional to 611,873.40, 917,810.10 and 521,331.60 is: 781,997.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,873.40 : 917,810.10 = 521,331.60 : x
  2. Step 2: Convert to fraction form
    611,873.40/917,810.10 = 521,331.60/x
  3. Step 3: Cross multiply
    611,873.40x = 917,810.10 × 521,331.60
  4. Step 4: Simplify right side
    611,873.40x = 478,483,407,929.16
  5. Step 5: Solve for x
    x = 478,483,407,929.16/611,873.40
  6. Step 6: Final answer
    x = 781,997.40

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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.