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Finding the Fourth Proportional to 643,351.40, 965,948.70 and 363,415.40

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Solution

The fourth proportional to 643,351.40, 965,948.70 and 363,415.40 is: 545,643.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,351.40 : 965,948.70 = 363,415.40 : x
  2. Step 2: Convert to fraction form
    643,351.40/965,948.70 = 363,415.40/x
  3. Step 3: Cross multiply
    643,351.40x = 965,948.70 × 363,415.40
  4. Step 4: Simplify right side
    643,351.40x = 351,040,633,189.98
  5. Step 5: Solve for x
    x = 351,040,633,189.98/643,351.40
  6. Step 6: Final answer
    x = 545,643.69

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1.5x scale

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.