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Finding the Fourth Proportional to 7,239.50, 9,990.78 and 4,214.37

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Solution

The fourth proportional to 7,239.50, 9,990.78 and 4,214.37 is: 5,815.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239.50 : 9,990.78 = 4,214.37 : x
  2. Step 2: Convert to fraction form
    7,239.50/9,990.78 = 4,214.37/x
  3. Step 3: Cross multiply
    7,239.50x = 9,990.78 × 4,214.37
  4. Step 4: Simplify right side
    7,239.50x = 42,104,843.51
  5. Step 5: Solve for x
    x = 42,104,843.51/7,239.50
  6. Step 6: Final answer
    x = 5,815.99

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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.