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Finding the Fourth Proportional to 9,387.78, 12,955.03 and 5,138.83

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Solution

The fourth proportional to 9,387.78, 12,955.03 and 5,138.83 is: 7,091.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,387.78 : 12,955.03 = 5,138.83 : x
  2. Step 2: Convert to fraction form
    9,387.78/12,955.03 = 5,138.83/x
  3. Step 3: Cross multiply
    9,387.78x = 12,955.03 × 5,138.83
  4. Step 4: Simplify right side
    9,387.78x = 66,573,696.81
  5. Step 5: Solve for x
    x = 66,573,696.81/9,387.78
  6. Step 6: Final answer
    x = 7,091.53

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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.