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Finding the Fourth Proportional to 709,416.30, 979,015.31 and 387,147.21

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Solution

The fourth proportional to 709,416.30, 979,015.31 and 387,147.21 is: 534,274.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,416.30 : 979,015.31 = 387,147.21 : x
  2. Step 2: Convert to fraction form
    709,416.30/979,015.31 = 387,147.21/x
  3. Step 3: Cross multiply
    709,416.30x = 979,015.31 × 387,147.21
  4. Step 4: Simplify right side
    709,416.30x = 379,023,043,878.05
  5. Step 5: Solve for x
    x = 379,023,043,878.05/709,416.30
  6. Step 6: Final answer
    x = 534,274.51

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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.