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Finding the Fourth Proportional to 7,239.54, 9,981.80 and 6,118.50

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Solution

The fourth proportional to 7,239.54, 9,981.80 and 6,118.50 is: 8,436.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,239.54 : 9,981.80 = 6,118.50 : x
  2. Step 2: Convert to fraction form
    7,239.54/9,981.80 = 6,118.50/x
  3. Step 3: Cross multiply
    7,239.54x = 9,981.80 × 6,118.50
  4. Step 4: Simplify right side
    7,239.54x = 61,073,643.30
  5. Step 5: Solve for x
    x = 61,073,643.30/7,239.54
  6. Step 6: Final answer
    x = 8,436.12

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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.