Home / 643,487.36-888,036.28-388,789.34

Finding the Fourth Proportional to 643,487.36, 888,036.28 and 388,789.34

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Solution

The fourth proportional to 643,487.36, 888,036.28 and 388,789.34 is: 536,543.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,487.36 : 888,036.28 = 388,789.34 : x
  2. Step 2: Convert to fraction form
    643,487.36/888,036.28 = 388,789.34/x
  3. Step 3: Cross multiply
    643,487.36x = 888,036.28 × 388,789.34
  4. Step 4: Simplify right side
    643,487.36x = 345,259,033,785.10
  5. Step 5: Solve for x
    x = 345,259,033,785.10/643,487.36
  6. Step 6: Final answer
    x = 536,543.62

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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.