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Finding the Fourth Proportional to 868,709.13, 1,198,817.79 and 486,738.66

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Solution

The fourth proportional to 868,709.13, 1,198,817.79 and 486,738.66 is: 671,698.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    868,709.13 : 1,198,817.79 = 486,738.66 : x
  2. Step 2: Convert to fraction form
    868,709.13/1,198,817.79 = 486,738.66/x
  3. Step 3: Cross multiply
    868,709.13x = 1,198,817.79 × 486,738.66
  4. Step 4: Simplify right side
    868,709.13x = 583,510,964,688.76
  5. Step 5: Solve for x
    x = 583,510,964,688.76/868,709.13
  6. Step 6: Final answer
    x = 671,698.90

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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.