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Finding the Fourth Proportional to 13,128.46, 18,117.71 and 7,160.46

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Solution

The fourth proportional to 13,128.46, 18,117.71 and 7,160.46 is: 9,881.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.46 : 18,117.71 = 7,160.46 : x
  2. Step 2: Convert to fraction form
    13,128.46/18,117.71 = 7,160.46/x
  3. Step 3: Cross multiply
    13,128.46x = 18,117.71 × 7,160.46
  4. Step 4: Simplify right side
    13,128.46x = 129,731,060.85
  5. Step 5: Solve for x
    x = 129,731,060.85/13,128.46
  6. Step 6: Final answer
    x = 9,881.67

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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.