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Finding the Fourth Proportional to 709,920.88, 979,711 and 387,651.44

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Solution

The fourth proportional to 709,920.88, 979,711 and 387,651.44 is: 534,970.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,920.88 : 979,711 = 387,651.44 : x
  2. Step 2: Convert to fraction form
    709,920.88/979,711 = 387,651.44/x
  3. Step 3: Cross multiply
    709,920.88x = 979,711 × 387,651.44
  4. Step 4: Simplify right side
    709,920.88x = 379,786,379,933.84
  5. Step 5: Solve for x
    x = 379,786,379,933.84/709,920.88
  6. Step 6: Final answer
    x = 534,970.01

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1.5x scale

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.