Home / 661,639.10-991,146.45-394,606.40

Finding the Fourth Proportional to 661,639.10, 991,146.45 and 394,606.40

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Solution

The fourth proportional to 661,639.10, 991,146.45 and 394,606.40 is: 591,126.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,639.10 : 991,146.45 = 394,606.40 : x
  2. Step 2: Convert to fraction form
    661,639.10/991,146.45 = 394,606.40/x
  3. Step 3: Cross multiply
    661,639.10x = 991,146.45 × 394,606.40
  4. Step 4: Simplify right side
    661,639.10x = 391,112,732,507.28
  5. Step 5: Solve for x
    x = 391,112,732,507.28/661,639.10
  6. Step 6: Final answer
    x = 591,126.99

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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.