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Finding the Fourth Proportional to 9,878.82, 13,632.80 and 5,402.60

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Solution

The fourth proportional to 9,878.82, 13,632.80 and 5,402.60 is: 7,455.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,878.82 : 13,632.80 = 5,402.60 : x
  2. Step 2: Convert to fraction form
    9,878.82/13,632.80 = 5,402.60/x
  3. Step 3: Cross multiply
    9,878.82x = 13,632.80 × 5,402.60
  4. Step 4: Simplify right side
    9,878.82x = 73,652,470.10
  5. Step 5: Solve for x
    x = 73,652,470.10/9,878.82
  6. Step 6: Final answer
    x = 7,455.59

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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.