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Finding the Fourth Proportional to 7,239.48, 9,990.50 and 3,927.48

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Solution

The fourth proportional to 7,239.48, 9,990.50 and 3,927.48 is: 5,419.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239.48 : 9,990.50 = 3,927.48 : x
  2. Step 2: Convert to fraction form
    7,239.48/9,990.50 = 3,927.48/x
  3. Step 3: Cross multiply
    7,239.48x = 9,990.50 × 3,927.48
  4. Step 4: Simplify right side
    7,239.48x = 39,237,488.94
  5. Step 5: Solve for x
    x = 39,237,488.94/7,239.48
  6. Step 6: Final answer
    x = 5,419.93

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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.