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Finding the Fourth Proportional to 643,750.92, 888,390.86 and 357,289.46

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Solution

The fourth proportional to 643,750.92, 888,390.86 and 357,289.46 is: 493,067.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,750.92 : 888,390.86 = 357,289.46 : x
  2. Step 2: Convert to fraction form
    643,750.92/888,390.86 = 357,289.46/x
  3. Step 3: Cross multiply
    643,750.92x = 888,390.86 × 357,289.46
  4. Step 4: Simplify right side
    643,750.92x = 317,412,690,638.34
  5. Step 5: Solve for x
    x = 317,412,690,638.34/643,750.92
  6. Step 6: Final answer
    x = 493,067.55

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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.