Home / 12,385.40-18,553.80-7,440.35

Finding the Fourth Proportional to 12,385.40, 18,553.80 and 7,440.35

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Solution

The fourth proportional to 12,385.40, 18,553.80 and 7,440.35 is: 11,145.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,385.40 : 18,553.80 = 7,440.35 : x
  2. Step 2: Convert to fraction form
    12,385.40/18,553.80 = 7,440.35/x
  3. Step 3: Cross multiply
    12,385.40x = 18,553.80 × 7,440.35
  4. Step 4: Simplify right side
    12,385.40x = 138,046,765.83
  5. Step 5: Solve for x
    x = 138,046,765.83/12,385.40
  6. Step 6: Final answer
    x = 11,145.93

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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.