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Finding the Fourth Proportional to 9,918.78, 13,661.64 and 7,392.80

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Solution

The fourth proportional to 9,918.78, 13,661.64 and 7,392.80 is: 10,182.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,918.78 : 13,661.64 = 7,392.80 : x
  2. Step 2: Convert to fraction form
    9,918.78/13,661.64 = 7,392.80/x
  3. Step 3: Cross multiply
    9,918.78x = 13,661.64 × 7,392.80
  4. Step 4: Simplify right side
    9,918.78x = 100,997,703.88
  5. Step 5: Solve for x
    x = 100,997,703.88/9,918.78
  6. Step 6: Final answer
    x = 10,182.47

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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.