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Finding the Fourth Proportional to 621,315.18, 857,643.75 and 545,640.21

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Solution

The fourth proportional to 621,315.18, 857,643.75 and 545,640.21 is: 753,184.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,315.18 : 857,643.75 = 545,640.21 : x
  2. Step 2: Convert to fraction form
    621,315.18/857,643.75 = 545,640.21/x
  3. Step 3: Cross multiply
    621,315.18x = 857,643.75 × 545,640.21
  4. Step 4: Simplify right side
    621,315.18x = 467,964,915,855.19
  5. Step 5: Solve for x
    x = 467,964,915,855.19/621,315.18
  6. Step 6: Final answer
    x = 753,184.42

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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.