Home / 13,156.98-18,156.87-7,188.90

Finding the Fourth Proportional to 13,156.98, 18,156.87 and 7,188.90

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Solution

The fourth proportional to 13,156.98, 18,156.87 and 7,188.90 is: 9,920.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,156.98 : 18,156.87 = 7,188.90 : x
  2. Step 2: Convert to fraction form
    13,156.98/18,156.87 = 7,188.90/x
  3. Step 3: Cross multiply
    13,156.98x = 18,156.87 × 7,188.90
  4. Step 4: Simplify right side
    13,156.98x = 130,527,922.74
  5. Step 5: Solve for x
    x = 130,527,922.74/13,156.98
  6. Step 6: Final answer
    x = 9,920.81

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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.