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Finding the Fourth Proportional to 666,904.05, 920,415.20 and 380,358.45

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Solution

The fourth proportional to 666,904.05, 920,415.20 and 380,358.45 is: 524,944.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,904.05 : 920,415.20 = 380,358.45 : x
  2. Step 2: Convert to fraction form
    666,904.05/920,415.20 = 380,358.45/x
  3. Step 3: Cross multiply
    666,904.05x = 920,415.20 × 380,358.45
  4. Step 4: Simplify right side
    666,904.05x = 350,087,697,877.54
  5. Step 5: Solve for x
    x = 350,087,697,877.54/666,904.05
  6. Step 6: Final answer
    x = 524,944.63

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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.