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Finding the Fourth Proportional to 643,406.40, 965,887.20 and 638,740.80

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Solution

The fourth proportional to 643,406.40, 965,887.20 and 638,740.80 is: 958,883.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,406.40 : 965,887.20 = 638,740.80 : x
  2. Step 2: Convert to fraction form
    643,406.40/965,887.20 = 638,740.80/x
  3. Step 3: Cross multiply
    643,406.40x = 965,887.20 × 638,740.80
  4. Step 4: Simplify right side
    643,406.40x = 616,951,562,837.76
  5. Step 5: Solve for x
    x = 616,951,562,837.76/643,406.40
  6. Step 6: Final answer
    x = 958,883.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.