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Finding the Fourth Proportional to 10,661.40, 15,992.10 and 7,320.60

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Solution

The fourth proportional to 10,661.40, 15,992.10 and 7,320.60 is: 10,980.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661.40 : 15,992.10 = 7,320.60 : x
  2. Step 2: Convert to fraction form
    10,661.40/15,992.10 = 7,320.60/x
  3. Step 3: Cross multiply
    10,661.40x = 15,992.10 × 7,320.60
  4. Step 4: Simplify right side
    10,661.40x = 117,071,767.26
  5. Step 5: Solve for x
    x = 117,071,767.26/10,661.40
  6. Step 6: Final answer
    x = 10,980.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.