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Finding the Fourth Proportional to 643,809.72, 888,450.70 and 357,332.28

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Solution

The fourth proportional to 643,809.72, 888,450.70 and 357,332.28 is: 493,114.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,809.72 : 888,450.70 = 357,332.28 : x
  2. Step 2: Convert to fraction form
    643,809.72/888,450.70 = 357,332.28/x
  3. Step 3: Cross multiply
    643,809.72x = 888,450.70 × 357,332.28
  4. Step 4: Simplify right side
    643,809.72x = 317,472,114,298.60
  5. Step 5: Solve for x
    x = 317,472,114,298.60/643,809.72
  6. Step 6: Final answer
    x = 493,114.82

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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.