Home / 810,920.76-1,215,200.12-389,704.56

Finding the Fourth Proportional to 810,920.76, 1,215,200.12 and 389,704.56

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Solution

The fourth proportional to 810,920.76, 1,215,200.12 and 389,704.56 is: 583,989.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,920.76 : 1,215,200.12 = 389,704.56 : x
  2. Step 2: Convert to fraction form
    810,920.76/1,215,200.12 = 389,704.56/x
  3. Step 3: Cross multiply
    810,920.76x = 1,215,200.12 × 389,704.56
  4. Step 4: Simplify right side
    810,920.76x = 473,569,028,076.55
  5. Step 5: Solve for x
    x = 473,569,028,076.55/810,920.76
  6. Step 6: Final answer
    x = 583,989.28

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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.