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Finding the Fourth Proportional to 621,317.18, 857,646.51 and 545,642.21

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Solution

The fourth proportional to 621,317.18, 857,646.51 and 545,642.21 is: 753,187.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,317.18 : 857,646.51 = 545,642.21 : x
  2. Step 2: Convert to fraction form
    621,317.18/857,646.51 = 545,642.21/x
  3. Step 3: Cross multiply
    621,317.18x = 857,646.51 × 545,642.21
  4. Step 4: Simplify right side
    621,317.18x = 467,968,137,115.19
  5. Step 5: Solve for x
    x = 467,968,137,115.19/621,317.18
  6. Step 6: Final answer
    x = 753,187.18

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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.