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Finding the Fourth Proportional to 666,903.80, 920,414.85 and 380,358.20

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Solution

The fourth proportional to 666,903.80, 920,414.85 and 380,358.20 is: 524,944.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,903.80 : 920,414.85 = 380,358.20 : x
  2. Step 2: Convert to fraction form
    666,903.80/920,414.85 = 380,358.20/x
  3. Step 3: Cross multiply
    666,903.80x = 920,414.85 × 380,358.20
  4. Step 4: Simplify right side
    666,903.80x = 350,087,335,161.92
  5. Step 5: Solve for x
    x = 350,087,335,161.92/666,903.80
  6. Step 6: Final answer
    x = 524,944.28

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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.