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Finding the Fourth Proportional to 7,980.40, 11,004.96 and 6,784

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Solution

The fourth proportional to 7,980.40, 11,004.96 and 6,784 is: 9,355.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.40 : 11,004.96 = 6,784 : x
  2. Step 2: Convert to fraction form
    7,980.40/11,004.96 = 6,784/x
  3. Step 3: Cross multiply
    7,980.40x = 11,004.96 × 6,784
  4. Step 4: Simplify right side
    7,980.40x = 74,657,648.64
  5. Step 5: Solve for x
    x = 74,657,648.64/7,980.40
  6. Step 6: Final answer
    x = 9,355.13

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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.