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Finding the Fourth Proportional to 259,417.40, 389,078.10 and 72,390.20

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Solution

The fourth proportional to 259,417.40, 389,078.10 and 72,390.20 is: 108,571.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,417.40 : 389,078.10 = 72,390.20 : x
  2. Step 2: Convert to fraction form
    259,417.40/389,078.10 = 72,390.20/x
  3. Step 3: Cross multiply
    259,417.40x = 389,078.10 × 72,390.20
  4. Step 4: Simplify right side
    259,417.40x = 28,165,441,474.62
  5. Step 5: Solve for x
    x = 28,165,441,474.62/259,417.40
  6. Step 6: Final answer
    x = 108,571.91

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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.