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Finding the Fourth Proportional to 7,459.90, 10,239.62 and 7,139.14

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Solution

The fourth proportional to 7,459.90, 10,239.62 and 7,139.14 is: 9,799.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,459.90 : 10,239.62 = 7,139.14 : x
  2. Step 2: Convert to fraction form
    7,459.90/10,239.62 = 7,139.14/x
  3. Step 3: Cross multiply
    7,459.90x = 10,239.62 × 7,139.14
  4. Step 4: Simplify right side
    7,459.90x = 73,102,019.43
  5. Step 5: Solve for x
    x = 73,102,019.43/7,459.90
  6. Step 6: Final answer
    x = 9,799.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.