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Finding the Fourth Proportional to 643,610.87, 888,180.09 and 357,130.34

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Solution

The fourth proportional to 643,610.87, 888,180.09 and 357,130.34 is: 492,838.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,610.87 : 888,180.09 = 357,130.34 : x
  2. Step 2: Convert to fraction form
    643,610.87/888,180.09 = 357,130.34/x
  3. Step 3: Cross multiply
    643,610.87x = 888,180.09 × 357,130.34
  4. Step 4: Simplify right side
    643,610.87x = 317,196,057,522.93
  5. Step 5: Solve for x
    x = 317,196,057,522.93/643,610.87
  6. Step 6: Final answer
    x = 492,838.25

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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.