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Finding the Fourth Proportional to 643,865.06, 888,373.69 and 357,313.38

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Solution

The fourth proportional to 643,865.06, 888,373.69 and 357,313.38 is: 493,003.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,865.06 : 888,373.69 = 357,313.38 : x
  2. Step 2: Convert to fraction form
    643,865.06/888,373.69 = 357,313.38/x
  3. Step 3: Cross multiply
    643,865.06x = 888,373.69 × 357,313.38
  4. Step 4: Simplify right side
    643,865.06x = 317,427,804,983.69
  5. Step 5: Solve for x
    x = 317,427,804,983.69/643,865.06
  6. Step 6: Final answer
    x = 493,003.62

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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.