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Finding the Fourth Proportional to 677,438.80, 934,906.92 and 390,977.34

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Solution

The fourth proportional to 677,438.80, 934,906.92 and 390,977.34 is: 539,572.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,438.80 : 934,906.92 = 390,977.34 : x
  2. Step 2: Convert to fraction form
    677,438.80/934,906.92 = 390,977.34/x
  3. Step 3: Cross multiply
    677,438.80x = 934,906.92 × 390,977.34
  4. Step 4: Simplify right side
    677,438.80x = 365,527,420,729.19
  5. Step 5: Solve for x
    x = 365,527,420,729.19/677,438.80
  6. Step 6: Final answer
    x = 539,572.61

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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.