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Finding the Fourth Proportional to 643,637.75, 888,217.25 and 357,157.15

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Solution

The fourth proportional to 643,637.75, 888,217.25 and 357,157.15 is: 492,875.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,637.75 : 888,217.25 = 357,157.15 : x
  2. Step 2: Convert to fraction form
    643,637.75/888,217.25 = 357,157.15/x
  3. Step 3: Cross multiply
    643,637.75x = 888,217.25 × 357,157.15
  4. Step 4: Simplify right side
    643,637.75x = 317,233,137,584.51
  5. Step 5: Solve for x
    x = 317,233,137,584.51/643,637.75
  6. Step 6: Final answer
    x = 492,875.29

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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.