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Finding the Fourth Proportional to 643,813.92, 888,485.76 and 357,365.52

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Solution

The fourth proportional to 643,813.92, 888,485.76 and 357,365.52 is: 493,176.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,813.92 : 888,485.76 = 357,365.52 : x
  2. Step 2: Convert to fraction form
    643,813.92/888,485.76 = 357,365.52/x
  3. Step 3: Cross multiply
    643,813.92x = 888,485.76 × 357,365.52
  4. Step 4: Simplify right side
    643,813.92x = 317,514,175,635.00
  5. Step 5: Solve for x
    x = 317,514,175,635.00/643,813.92
  6. Step 6: Final answer
    x = 493,176.93

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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.