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Finding the Fourth Proportional to 686,722.88, 947,672.82 and 380,799.45

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Solution

The fourth proportional to 686,722.88, 947,672.82 and 380,799.45 is: 525,500.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,722.88 : 947,672.82 = 380,799.45 : x
  2. Step 2: Convert to fraction form
    686,722.88/947,672.82 = 380,799.45/x
  3. Step 3: Cross multiply
    686,722.88x = 947,672.82 × 380,799.45
  4. Step 4: Simplify right side
    686,722.88x = 360,873,288,635.95
  5. Step 5: Solve for x
    x = 360,873,288,635.95/686,722.88
  6. Step 6: Final answer
    x = 525,500.60

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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.