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Finding the Fourth Proportional to 709,949.80, 979,734.32 and 387,659.89

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Solution

The fourth proportional to 709,949.80, 979,734.32 and 387,659.89 is: 534,972.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,949.80 : 979,734.32 = 387,659.89 : x
  2. Step 2: Convert to fraction form
    709,949.80/979,734.32 = 387,659.89/x
  3. Step 3: Cross multiply
    709,949.80x = 979,734.32 × 387,659.89
  4. Step 4: Simplify right side
    709,949.80x = 379,803,698,720.43
  5. Step 5: Solve for x
    x = 379,803,698,720.43/709,949.80
  6. Step 6: Final answer
    x = 534,972.61

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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.