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Finding the Fourth Proportional to 643,887.51, 888,520.29 and 357,385.05

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Solution

The fourth proportional to 643,887.51, 888,520.29 and 357,385.05 is: 493,166.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,887.51 : 888,520.29 = 357,385.05 : x
  2. Step 2: Convert to fraction form
    643,887.51/888,520.29 = 357,385.05/x
  3. Step 3: Cross multiply
    643,887.51x = 888,520.29 × 357,385.05
  4. Step 4: Simplify right side
    643,887.51x = 317,543,867,443.94
  5. Step 5: Solve for x
    x = 317,543,867,443.94/643,887.51
  6. Step 6: Final answer
    x = 493,166.68

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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.