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Finding the Fourth Proportional to 643,636.40, 888,215.28 and 357,155.84

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Solution

The fourth proportional to 643,636.40, 888,215.28 and 357,155.84 is: 492,873.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,636.40 : 888,215.28 = 357,155.84 : x
  2. Step 2: Convert to fraction form
    643,636.40/888,215.28 = 357,155.84/x
  3. Step 3: Cross multiply
    643,636.40x = 888,215.28 × 357,155.84
  4. Step 4: Simplify right side
    643,636.40x = 317,231,274,429.24
  5. Step 5: Solve for x
    x = 317,231,274,429.24/643,636.40
  6. Step 6: Final answer
    x = 492,873.42

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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.