Home / 13,121.22-18,106.82-7,152.76

Finding the Fourth Proportional to 13,121.22, 18,106.82 and 7,152.76

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Solution

The fourth proportional to 13,121.22, 18,106.82 and 7,152.76 is: 9,870.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.22 : 18,106.82 = 7,152.76 : x
  2. Step 2: Convert to fraction form
    13,121.22/18,106.82 = 7,152.76/x
  3. Step 3: Cross multiply
    13,121.22x = 18,106.82 × 7,152.76
  4. Step 4: Simplify right side
    13,121.22x = 129,513,737.82
  5. Step 5: Solve for x
    x = 129,513,737.82/13,121.22
  6. Step 6: Final answer
    x = 9,870.56

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Half scale
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Double scale
Find fourth proportional to 13,122.22, 18,108.20 and 7,153.76
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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.