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Finding the Fourth Proportional to 7,145.40, 9,926.76 and 7,081.32

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Solution

The fourth proportional to 7,145.40, 9,926.76 and 7,081.32 is: 9,837.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,145.40 : 9,926.76 = 7,081.32 : x
  2. Step 2: Convert to fraction form
    7,145.40/9,926.76 = 7,081.32/x
  3. Step 3: Cross multiply
    7,145.40x = 9,926.76 × 7,081.32
  4. Step 4: Simplify right side
    7,145.40x = 70,294,564.12
  5. Step 5: Solve for x
    x = 70,294,564.12/7,145.40
  6. Step 6: Final answer
    x = 9,837.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.